{"product_id":"ramp-door-spring-kit-single-spring-100lb-72-tube-boxed-cb100s72s","title":"Ramp Door Spring Kit - Single Spring 100lb Assist with 72\" Tube (CB100S72S)","description":"\u003cstyle\u003e\n  .rp-mag-lock{\n    --rp-black:#111111;\n    --rp-charcoal:#1d1d1f;\n    --rp-gray:#6b7280;\n    --rp-light:#f5f5f5;\n    --rp-line:#d8d8d8;\n    --rp-maroon:#6e0f11;\n    --rp-gold:#d7a126;\n    --rp-cream:#fff7e3;\n    --rp-shadow:0 16px 36px rgba(0,0,0,.08);\n    --rp-radius:20px;\n    font-family:\"Helvetica Neue\",Helvetica,Arial,sans-serif;\n    color:var(--rp-black);\n    line-height:1.6;\n  }\n\n  .rp-mag-lock *{\n    box-sizing:border-box;\n  }\n\n  .rp-mag-lock .rp-shell{\n    max-width:1080px;\n    margin:0 auto;\n    padding:28px 18px 40px 18px;\n    background:\n      linear-gradient(180deg,#fafafa 0%,#ffffff 22%,#ffffff 100%);\n  }\n\n  .rp-mag-lock .rp-hero{\n    position:relative;\n    overflow:hidden;\n    border:1px solid #ececec;\n    border-radius:28px;\n    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class=\"rp-mag-lock\"\u003e\n\u003cdiv class=\"rp-shell\"\u003e\n\u003cdiv class=\"rp-hero\"\u003e\n\u003cdiv class=\"rp-logo\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/2659\/6148\/files\/LOGO-FINALx200.png?v=1763669885\" alt=\"R \u0026amp; P Carriages\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"rp-kicker\"\u003eTrailer Ramp Assistance \/ Single Spring System\u003c\/div\u003e\n\u003ch1 class=\"rp-title\"\u003eCB100S72S Ramp Door Spring Kit - Single Spring 100 lb Assist with 72\" Tube\u003c\/h1\u003e\n\u003cp class=\"rp-subhead\"\u003eSingle-spring torsion ramp assist kit for enclosed trailer ramp doors. Designed to help counterbalance the ramp door when properly installed, adjusted, and matched to the trailer door weight.\u003c\/p\u003e\n\u003cdiv class=\"rp-partline\"\u003e\n\u003cspan class=\"rp-badge\"\u003ePart Number: CB100S72S\u003c\/span\u003e \u003cspan class=\"rp-badge alt\"\u003e100 lb Assist Rating\u003c\/span\u003e \u003cspan class=\"rp-badge alt\"\u003e72\" Tube\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"rp-section rp-grid-2\"\u003e\n\u003cdiv class=\"rp-card\"\u003e\n\u003cdiv class=\"rp-rule-title\"\u003e\n\u003ch2\u003eOverview\u003c\/h2\u003e\n\u003c\/div\u003e\n\u003cp class=\"rp-lead\"\u003eThis R\u0026amp;P Carriages CB100S72S ramp door spring kit is a single torsion spring assist system for enclosed trailer ramp doors. The kit is intended for ramp-style rear doors where the spring rating, tube length, mounting layout, cable routing, and door weight match the application. When correctly installed and wound, the spring system helps reduce the lifting effort required to raise the ramp door and helps control door movement during normal operation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"rp-card rp-service\"\u003e\n\u003ch2\u003eR\u0026amp;P Service Insight\u003c\/h2\u003e\n\u003cp\u003eRamp door spring systems are high-tension service components. Correct spring orientation, winding direction, and cable routing are critical to safe operation.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside-Looking-Out Orientation:\u003c\/strong\u003e The installation manual states that, standing inside the trailer looking out, the black cable drum should be on the left-hand side.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWind Down, Not Up:\u003c\/strong\u003e The manual specifies that the spring should be wound down by pulling the winding bars, not pushing them.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUse Proper Winding Bars:\u003c\/strong\u003e The manual calls for 1\/2\" diameter bars and recommends approximately 18\" length for winding.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"rp-section\"\u003e\n\u003cdiv class=\"rp-card rp-knowledge\"\u003e\n\u003ch2\u003eR\u0026amp;P Knowledge Hub\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Intended for enclosed trailer ramp door spring assist applications where the 72\" tube length, 100 lb spring rating, brackets, drums, and cable layout match the trailer.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eVehicle \/ System Fit:\u003c\/strong\u003e Trailer rear ramp door torsion spring assist system.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInstallation Notes:\u003c\/strong\u003e The manual notes that cable mounting brackets should position the cable so it lines up with the outside edge of the door frame, and the cable should spool properly on the drum without rubbing.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePerformance Insight:\u003c\/strong\u003e The manual states each spring is calculated by springing weight at ten full turns per spring, with door weight varying within a limited range. Proper balance must be verified after winding.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"rp-section\"\u003e\n\u003cdiv class=\"rp-card rp-knowledge\"\u003e\n\u003ch2\u003eBrand \u0026amp; Fitment Note\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eSelling Brand:\u003c\/strong\u003e R\u0026amp;P Carriages\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eApplication Reference:\u003c\/strong\u003e Any trailer or platform names in this listing describe compatibility, fitment target, or application style only where measurements, mounting points, and configuration match.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat This Means:\u003c\/strong\u003e This listing is for a R\u0026amp;P Carriages ramp door spring assist kit, not a guaranteed OEM-branded item unless specifically stated and verified.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBefore Ordering:\u003c\/strong\u003e Verify ramp door weight, rear opening width, mounting space, tube length, cable path, drum orientation, and included components before installation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"rp-section\"\u003e\n\u003cdiv class=\"rp-card rp-service\"\u003e\n\u003ch2\u003eR\u0026amp;P Repair Insight\u003c\/h2\u003e\n\u003cp\u003eThe installation manual gives several checks that matter during replacement or first-time installation. These are not just setup details; they affect whether the door balances correctly and whether the cable tracks safely on the drums.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCable Path Check:\u003c\/strong\u003e Cables should travel down the back of the cable drum and through the door opening to the door attachment point. They should not cross the front of the cable drums.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWinding Direction Check:\u003c\/strong\u003e The spring should grow in length when wound. If it grows in diameter, it is being wound backward.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCover Timing Check:\u003c\/strong\u003e The manual cautions that the set screw cover should be installed only after the spring is wound and the door has been tested for proper balance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"rp-section\"\u003e\n\u003cdiv class=\"rp-rule-title\"\u003e\n\u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"rp-feature-grid\"\u003e\n\u003cdiv class=\"rp-feature\"\u003e\n\u003ch3\u003eSingle Spring Ramp Assist Design\u003c\/h3\u003e\n\u003cp\u003eDesigned as a single torsion spring system for enclosed trailer ramp door assistance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"rp-feature\"\u003e\n\u003ch3\u003e100 lb Assist Rating\u003c\/h3\u003e\n\u003cp\u003eListed as a 100 lb assist spring kit for matching ramp door applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"rp-feature\"\u003e\n\u003ch3\u003e72\" Tube Length\u003c\/h3\u003e\n\u003cp\u003eIncludes a 72\" tube configuration for compatible trailer rear ramp door installations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"rp-feature\"\u003e\n\u003ch3\u003eManual-Guided Setup Notes\u003c\/h3\u003e\n\u003cp\u003eInstallation guidance covers drum orientation, winding direction, cable routing, door balance checks, and set screw cover installation timing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"rp-section rp-grid-2\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"rp-rule-title\"\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"rp-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCB100S72S\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eR\u0026amp;P Carriages\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProduct Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRamp door spring assist kit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSpring Style\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSingle torsion spring system\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAssist Rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e100 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTube Length\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e72\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eApplication\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEnclosed trailer rear ramp door spring assist system\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInstallation Reference\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCB100S72S installation manual\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"rp-rule-title\"\u003e\n\u003ch2\u003eFitment \/ Application\u003c\/h2\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"rp-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eCategory\u003c\/th\u003e\n\u003cth\u003eDetails\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eVehicle \/ System\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEnclosed trailer ramp door spring assist system\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePrimary Fit\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRamp doors requiring a 100 lb single-spring assist kit with a 72\" tube\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOrientation Note\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eManual states black cable drum should be on the left when standing inside the trailer looking out.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWinding Note\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eManual states the spring should be wound down and should grow in length as it is wound.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNotes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eVerify ramp door weight, mounting bracket location, cable alignment, door balance, and trailer structure before ordering or installing.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"rp-section\"\u003e\n\u003cdiv class=\"rp-rule-title\"\u003e\n\u003ch2\u003eIncluded Components\u003c\/h2\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"rp-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity\u003c\/th\u003e\n\u003cth\u003eItem\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003ctd\u003eSingle torsion spring \/ 72\" tube ramp assist assembly\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003ctd\u003eCable drums\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003ctd\u003eMounting brackets\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003ctd\u003eLift cables\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003ctd\u003eSet screw cover\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded\u003c\/td\u003e\n\u003ctd\u003eAdditional small installation hardware shown with product; verify contents against current product photos before installation.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"rp-note\"\u003e\n\u003cstrong\u003eImportant Installation Warning:\u003c\/strong\u003e Torsion springs are under high tension and can cause serious injury if handled incorrectly. The installation manual recommends prior experience with torsion springs or professional installation. Use proper winding bars, keep control of the spring system while adjusting tension, inspect cables for fraying, and test the door for proper balance before installing the set screw cover. Do not exceed the manual’s stated winding limits, and verify all fitment and included components before installation.\u003c\/div\u003e\n\u003cdiv class=\"rp-manual-callout\"\u003e\n\u003cdiv class=\"rp-manual-inner\"\u003e\n\u003cdiv class=\"rp-manual-copy\"\u003e\n\u003cdiv class=\"rp-manual-icon\" aria-hidden=\"true\"\u003e\u003csvg viewbox=\"0 0 64 64\" role=\"img\"\u003e\n              \u003cpath d=\"M18 6h22l12 12v40H18z\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"5\" stroke-linejoin=\"round\"\u003e\u003c\/path\u003e\n              \u003cpath d=\"M40 6v14h12\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"5\" stroke-linejoin=\"round\"\u003e\u003c\/path\u003e\n              \u003cpath d=\"M24 32h16M24 42h16M24 52h10\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"5\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\n            \u003c\/svg\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003ch2\u003eInstallation Manual Available\u003c\/h2\u003e\n\u003cp\u003eReview the CB100S72S manual before installation for winding direction, drum orientation, cable routing, balance testing, and set screw cover instructions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ca class=\"rp-manual-btn\" href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/2659\/6148\/files\/CB100S72S.pdf?v=1780333916\" rel=\"noopener\" target=\"_blank\"\u003e \u003cspan class=\"rp-mini-icon\"\u003ePDF\u003c\/span\u003e View Manual \u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"rp-cta-wrap\"\u003e\u003ca class=\"rp-btn\" href=\"\/collections\/trailer-ramp-springs\"\u003eSHOP RELATED RAMP ASSIST PARTS\u003c\/a\u003e\u003c\/div\u003e\n\u003cdiv class=\"rp-seo\"\u003eCB100S72S ramp door spring kit, R\u0026amp;P Carriages trailer ramp spring, 100 lb ramp door assist, 72 inch ramp spring tube, enclosed trailer ramp door torsion spring, single spring ramp assist kit, trailer ramp lift spring, enclosed trailer rear door spring assist, ramp door cable drum spring kit, CB100S72S installation manual, trailer ramp spring installation guide\u003c\/div\u003e\n\u003cdiv class=\"rp-footer\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/2659\/6148\/files\/Baseball_AdvertisingRP-sign_1.jpg?v=1771533480\" alt=\"R \u0026amp; P Carriages\"\u003e\u003c\/div\u003e\n\u003chr style=\"border: 0; border-top: 1px solid #eee; margin: 24px 0 0 0;\"\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Need a Trailer Part","offers":[{"title":"Default Title","offer_id":51786219487518,"sku":"CB100S72S","price":259.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2659\/6148\/files\/CB100S72S-02.png?v=1780334177","url":"https:\/\/needatrailerpart.com\/products\/ramp-door-spring-kit-single-spring-100lb-72-tube-boxed-cb100s72s","provider":"Need a Trailer Part","version":"1.0","type":"link"}