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Your search for "trailer wiring harness" revealed the following:

Brake Magnet Replaces Dexter K71-378-00 Magnet fits all 12-1/4" Brakes after 1992 Plus Most 9000 lb axles (77M-1210)
Brake Magnet Replaces Dexter K71-378-00 Magnet fits all 12-1/4" Brakes after 1992 Plus Most 9000 lb axles (77M-1210)
$22.32
7-Way RV Blade Extension Cord — 48" Trailer Wiring Extension Cable (EXT-48-A)
7-Way RV Blade Extension Cord — 48" Trailer Wiring Extension Cable (EXT-48-A)
$29.99
12RVEBRH
One (1) 12" x 2" Right Brake Side Electric Trailer Axle Backing Plate Back (12RVEBRH)
$74.99
2" Hitch Bar 13" Length 15,000lb Weight Distributing 1000-1500lb Tongue Weight (63970)
2" Hitch Bar 13" Length 15,000lb Weight Distributing 1000-1500lb Tongue Weight (63970)
$162.18
HL34
ONE - 5/16" Heavy Duty Safety Chain Forged Hook Trailer Camper RV 11,700# (HL34)
$24.19
023-465-00
Dexter 12"x2" Never-Adjust Nev-R-Adjust Electric Trailer Brake Backing Plate 7000# Right Hand (023-465-00)
$187.25
Add Trailer Brakes Kit – 3500 lb Axle, 5 on 4.5 Bolt Pattern, Electric Self-Adjusting, Import, Complete Kit (94545-B-FSA-IMP-K1)
Add Trailer Brakes Kit – 3500 lb Axle, 5 on 4.5 Bolt Pattern, Electric Self-Adjusting, Import, Complete Kit (94545-B-FSA-IMP-K1)
$225.96
RAW Fulton Bulldog 2-5/16 Ball Coupler Trailer Hitch Channel Adjustable (A256CL1660-KIT)
RAW Fulton Bulldog 2-5/16 Ball Coupler Trailer Hitch Channel Adjustable (A256CL1660-KIT)
$114.56
Painted Fulton Bulldog 2-5/16 Ball Coupler Trailer Hitch Channel Adjustable (P-A256CL1660)
Painted Fulton Bulldog 2-5/16 Ball Coupler Trailer Hitch Channel Adjustable (P-A256CL1660)
$114.56
15" Low Profile Red LED Stop Turn Tail Light RV Trailer Truck USA & Chrome Bezel (T10-rr00-1 + T10-0c00-1)
15" Low Profile Red LED Stop Turn Tail Light RV Trailer Truck USA & Chrome Bezel (T10-rr00-1 + T10-0c00-1)
$23.63
Pair of 2000 lb Hydraulic Trailer Brake Drum Kits — 7" Drum with Bearing Kits (008-271-07-KITX2)
Pair of 2000 lb Hydraulic Trailer Brake Drum Kits — 7" Drum with Bearing Kits (008-271-07-KITX2)
$313.89
4B6M
Bulldog Tongue Coupler Trailer Hitch 2 5/16" Ball Channel Mount 12,500# (4B6M-KIT)
$165.07