Drilled 30K Gooseneck to 5th Wheel Adapter | 4" Round Drilled Tube
Heavy-duty 4-inch round adapter engineered to convert gooseneck trailers for use with standard 5th wheel hitches, featuring mechanical through-pinning for maximum security.
Overview
The 2085205-DRILLED is a structural steel adapter that replaces the inner tube of a standard gooseneck coupler. By converting the connection point to a 2" SAE Kingpin, this adapter allows you to pull your gooseneck trailer with a standard 5th wheel plate. The "Drilled" configuration is preferred for heavy-haul applications, providing a mechanical failsafe alongside traditional set screws.
R&P Service Insight
This adapter is essential for fleets or owners moving between different truck hitch configurations without modifying the trailer chassis.
- Raw Steel: Shipped unpainted to allow for custom welding or specialized coatings if required.
- Secure Pinning: Pre-machined 7/8" holes prevent tube "creep" under extreme heavy-duty loads.
- Standardized Fit: Integrated 2" SAE Kingpin is compatible with all major commercial and RV 5th wheel hitch brands.
R&P Knowledge Hub
Compatibility: Designed specifically for trailers equipped with a standard 4" Round inner tube gooseneck assembly.
System Fit: Fits 4" I.D. outer tubes and connects to any standard 2" SAE 5th wheel plate.
Installation Notes: Verify your outer tube diameter and hole orientation before ordering. Ensure set screws are torqued and safety pins are fully engaged.
Performance Insight: The 1/4" wall structural steel construction and 8" bolster plate are engineered to handle up to 30,000 lbs, providing a rigid, stable towing connection.
R&P Repair Insight
Before purchasing, confirm these critical measurements to ensure a safe and proper fit for your trailer conversion:
- Tube Diameter: Must be a 4" Round Outside Diameter (OD) to fit standard outer tubes correctly.
- Pin Alignment: Ensure your existing outer tube holes or set screws align with the 2-1/2" hole spacing.
- Structural Integrity: Do not drill through the existing structural seams of the pipe if performing custom modifications.
Features
30K Weight Capacity
Sturdy construction rated for a Gross Trailer Weight (GTW) of 30,000 lbs.
Precision Drilled
Includes (4) sets of 7/8" holes spaced 2-1/2" apart for height adjustment and mechanical locking.
Structural Steel Build
Features a heavy-duty 1/4" wall thickness for maximum durability and safety under load.
8" Bolster Plate
Provides a wide, stable contact surface for the 5th wheel hitch plate to reduce wear and movement.
Specifications
| Specification | Detail |
|---|---|
| Part Number | 2085205-DRILLED |
| Brand | Wallace Forge |
| Product Type | Gooseneck to Kingpin Adapter |
| Max Capacity | 30,000 lbs GTW |
| Material / Finish | Raw Structural Steel |
| Tube Diameter | 4" Round (O.D.) |
| Hole Size | 7/8" Diameter |
| Wall Thickness | 1/4" Heavy Duty |
| Pipe Length | 20" Total |
Fitment / Application
| Category | Details |
|---|---|
| Trailer Type | Gooseneck (Inner Tube Replacement) |
| Primary Fit | 4" I.D. Round Outer Tubes |
| Hitch Fit | Standard 2" SAE 5th Wheel Plate |
| Notes | Verify outer tube diameter and orientation. Does not increase vehicle towing capacity. |
Included Components
| Quantity | Item |
|---|---|
| 1 | 2085205-DRILLED Adapter Coupler (Raw Steel) |
| NOTE | Does not include through-pin or set screws (designed to use existing hardware). |
