B&W Turnoverball 4" Gooseneck Ball Hitch Extender – 20,000 lb GTW
Removable B&W gooseneck ball extender designed to move the trailer pivot point 4 inches rearward, providing additional cab clearance for compatible Turnoverball hitch systems.
Key Measurements & Specs
| Specification | Detail |
|---|---|
| Part Number / SKU | GNXA4085 |
| Brand | B&W Trailer Hitches |
| Product Type | Turnoverball gooseneck ball extender |
| Gross Trailer Weight | 20,000 lbs. GTW |
| Vertical Towing Weight | 5,000 lbs. VTW |
| Pivot-Point Offset | 4 inches rearward |
| Hole Opening | 1-1/2 inches |
| Construction | 3/4-inch steel plate |
| Design | Removable |
| Quantity Included | 1 gooseneck ball extender |
Fitment / Application
| Category | Details |
|---|---|
| Hitch System | B&W Turnoverball gooseneck hitch systems |
| Compatible Models | Compatible with Turnoverball models except GNRK1257 and GNRK1309 |
| Primary Application | Creates additional space between the truck cab and trailer during turning |
| Offset Direction | Moves the gooseneck trailer pivot point 4 inches toward the rear of the truck |
| Installation Style | Removable Turnoverball accessory |
| Fitment Check | Confirm the installed hitch is a compatible B&W Turnoverball model before ordering |
| Important Exclusion | Does not fit GNRK1257 or GNRK1309; those models require different extender part numbers |
Top Features
| Feature | Buyer Benefit |
|---|---|
| 4" Rearward Offset | Provides additional trailer-to-cab clearance during tighter turns |
| 20,000 lb GTW Rating | Supports compatible heavy-duty gooseneck towing applications within the complete system’s limits |
| 5,000 lb VTW Rating | Provides a defined vertical load capacity for proper towing-system matching |
| 3/4" Steel Plate | Delivers strong, durable construction for long-term towing use |
| Removable Design | Allows the extender to be installed when added clearance is needed and removed when it is not |
Overview
The B&W GNXA4085 Turnoverball 4" Extender is a removable gooseneck hitch accessory that relocates the trailer’s pivot point 4 inches toward the rear of the truck. This added offset provides more space between the truck cab and trailer, helping reduce the risk of contact during sharp turns. Built from 3/4-inch steel plate and rated for 20,000 lbs. GTW and 5,000 lbs. VTW, it delivers the solid, dependable towing performance associated with B&W Trailer Hitches.
R&P Service Insight
An offset gooseneck ball can provide useful additional clearance, but it does not eliminate the need to check the truck, hitch and trailer geometry before towing.
- Check the Hitch Model: Verify that the truck has a compatible B&W Turnoverball hitch and is not equipped with model GNRK1257 or GNRK1309.
- Confirm Turning Clearance: Carefully check cab, trailer, bed-rail and tailgate clearance throughout the expected turning range.
- Follow the Lowest Rating: Never exceed the lowest-rated component in the truck, hitch, extender, coupler or trailer combination.
R&P Knowledge Hub
Why Use a Gooseneck Extender? Cab-to-trailer clearance can become limited during sharp turns, especially when truck-bed length and trailer-nose geometry place the trailer close to the cab. Moving the pivot point rearward creates additional working space.
System Compatibility: GNXA4085 is designed for compatible B&W Turnoverball gooseneck hitch models. It is not a universal accessory for every under-bed or factory puck-system hitch.
Installation Notes: Remove the existing Turnoverball component and install the extender according to B&W instructions. Confirm that it is fully seated, correctly oriented and securely retained before connecting the trailer.
Performance Insight: The 4-inch rearward offset changes the pivot location without requiring a permanent alteration to the existing compatible Turnoverball hitch system.
Brand & Fitment Note
Selling Brand: B&W Trailer Hitches
Manufacturer Part Number: GNXA4085
Application Reference: Designed for B&W Turnoverball gooseneck hitch models except GNRK1257 and GNRK1309.
Excluded Models: B&W identifies GNXA4585 for GNRK1257 and GNXA4685 for GNRK1309.
Before Ordering: Confirm the B&W hitch model, opening measurement, required offset, trailer clearance and complete towing-system ratings.
R&P Repair Insight
Correct fit, orientation and retention are essential when installing any removable gooseneck ball accessory. Inspect both the extender and the Turnoverball socket before every towing trip.
- Inspect the Socket: Clear dirt, rust and debris that could prevent the extender from seating fully.
- Verify Retention: Confirm the hitch locking mechanism completely engages the extender before coupling the trailer.
- Check for Contact: Slowly test turning clearance in a controlled area before regular towing, watching the cab, bed rails, tailgate and trailer.
Features
Four-Inch Rearward Extension
Moves the trailer pivot point 4 inches toward the rear of the truck to provide additional clearance during tighter turning situations.
Heavy-Duty Towing Capacity
Rated for up to 20,000 lbs. gross trailer weight and 5,000 lbs. vertical towing weight when used within all applicable vehicle and towing-system limits.
Solid Steel Construction
Made from 3/4-inch steel plate for the strength and durability required in compatible gooseneck towing applications.
Removable Turnoverball Accessory
Installs into a compatible B&W Turnoverball system and can be removed when the additional offset is not required.
Additional Cab Clearance
The offset design helps reduce the risk of trailer-to-cab contact during sharp turns when proper clearance has been verified.
Dependable B&W Design
Built for a secure fit and long-lasting use in compatible B&W Turnoverball gooseneck hitch systems.
Included Components
| Quantity | Item |
|---|---|
| 1 | B&W Turnoverball 4" gooseneck ball extender, part number GNXA4085 |
| Not Included | Turnoverball under-bed hitch assembly, trailer coupler and safety-chain equipment |
