Find a 5th Wheel to Gooseneck Adapter That Fits
When shopping for a 5th wheel to gooseneck adapter for sale, check three things before comparing prices: your trailer’s pin box model, its loaded weight and pin weight, and the space between your truck cab and trailer during turns. Choose an adapter rated for your load, and confirm that your trailer maker approves the setup.
These adapters let a fifth-wheel trailer connect to a truck’s gooseneck ball. Some replace the pin box; others attach to the existing kingpin. The right choice can free up bed space, but the designs differ in fit, ride comfort, and upkeep.
I’m 📈Benjamin Beck, Growth Marketing Expert. My 14 years in SEO and product-focused content shape how I sort through options for shoppers searching for a 5th wheel to gooseneck adapter for sale: start with fit and safety, then compare features that matter on the road.
Benefits of Converting from a 5th Wheel to a Gooseneck Setup
Standard fifth wheel hitches provide a solid connection, but they come with a major drawback: a heavy, bulky hitch assembly sitting right in the middle of your truck bed. For anyone using their truck for daily hauling, work tasks, or other recreational gear, wrestling a 150-to-250-pound iron hitch in and out of the bed quickly becomes exhausting.
Converting to a gooseneck connection solves this problem while delivering several major advantages for heavy-duty towing:
- Clean, Usable Truck Bed Floor: Once uncoupled, simply pop out or fold down the 2-5/16″ gooseneck ball. Your truck bed instantly returns to completely flat cargo space for plywood, gravel, luggage, or tools.
- Multi-Trailer Versatility: If you haul livestock trailers, flatbeds, or equipment trailers equipped with gooseneck couplers, converting your RV means you can pull everything with a single truck setup.
- Lightweight Hookup Process: Instead of lining up a rigid, bulky fifth-wheel head, many gooseneck systems feature self-aligning coupler funnels, visual latch indicators, or remote release cables that simplify solo hitching.
- Cost-Effective Fleet Management: Rather than outfitting multiple work or family trucks with expensive fifth-wheel rail kits and heavy hitches, installing standard gooseneck pucks or hide-a-ball systems across vehicles offers uniform utility.
Top Options When Searching for a 5th Wheel to Gooseneck Adapter for Sale
Selecting a 5th wheel to gooseneck adapter depends largely on whether you want a full pin box replacement, a sleeve that locks over your current kingpin, or an in-bed adapter plate.
| Product / Model | Design Type | GTW Rating | Vertical Tongue Rating | Suspension / Cushioning | Compatible Pin Boxes / Hitch Fitment |
|---|---|---|---|---|---|
| Shocker Quick Air Kit | Replacement Pin Box | 24,000 lbs | 6,000 lbs | Air Spring Bag & Bumpers | Lippert 1621, 0719, Rhino, 1716, FabEx |
| Shocker Demco Coupler Kit | Replacement Pin Box | 24,000 lbs | 6,000 lbs | Rigid Steel (No Air Bag) | Lippert 1621, 0719, Rhino Box |
| B&W SumoSpring Adapter | Replacement Pin Box | Up to 24,000 lbs | Up to 6,000 lbs | Microcellular Polyurethane | Lippert 1621, 1621HD, 1116, 1716, Rhino |
| Andersen Ranch Hitch | Kingpin Coupler Adapter | 24,000 lbs | 6,000 lbs | Rigid Bell Housing | Universal 2″ Standard Kingpins |
| Wallace Forge Adapter | Kingpin-to-Gooseneck | 30,000 lbs | Commercial Spec | Solid Forged Steel | Standard 2″ Kingpin / Commercial Plate |
| Misakomo 2085295 | Kingpin Adapter Disc | 30,000 lbs | Commercial Spec | Solid Alloy Steel Disc | 2″ Kingpin to 2-5/16″ Ball Pocket |
| Reese Pro Series 49080 | In-Bed Base Rail Plate | 25,000 lbs | 6,250 lbs | Rigid Steel Plate | Standard Fifth Wheel In-Bed Rails |
| CURT 16310 X5 | Gooseneck Mount Plate | 20,000 lbs | 5,000 lbs | Rigid Steel Base | Square-Shank Gooseneck Hitches |
Complete Replacement Gooseneck Pin Boxes
Complete replacement systems bolt directly to your trailer’s existing pin box mounting wings. Because they completely remove the factory kingpin and replace it with a structural gooseneck down-tube, they eliminate leverage-induced frame stress.
The Shocker Quick Air 5th Wheel to Gooseneck Conversion Kit stands out as an elite solution for absorbing brutal highway chucking. Its integrated air spring bag is built to dampen fore-and-aft jerking motions and features a patented Shift Lock coupler that captures the 2-5/16″ ball from both sides. For a solid steel alternative without an onboard air system, the Shocker 5th Wheel to Gooseneck Demco Coupler Conversion Kit pairs the same high-strength structural pin box with Demco’s auto-latching EZ coupler.
Another premium choice in this category is the B&W Fifth Wheel to Gooseneck Adapter. Certified to rigid SAE J-2638 standards, it utilizes integrated SumoSpring microcellular polyurethane cushioning for dual-axis damping, giving you dependable shock absorption without any air lines to monitor.
Direct Kingpin Coupler Adapters
Direct kingpin adapters clamp onto your trailer’s standard 2-inch kingpin, extending downward to lock over a 2-5/16″ gooseneck ball.
The Andersen Ranch Hitch Adapter is rated for 24,000 lbs Gross Trailer Weight Rating (GTWR) and 6,000 lbs tongue weight. It stands out as an adapter meeting strict V19 safety benchmarks, offering 3 inches of vertical height adjustment and a handy remote cable release so you do not have to crawl into the truck bed to uncouple.
For commercial haulers or tractor conversions, heavy-duty forged units like the Gooseneck Trailer to Kingpin Adapter by Wallace Forge provide a 30,000 lb rating using a solid 2″ forged kingpin with a 1/2″ bolster. Similarly, the Misakomo 2085295 Kingpin Adapter delivers alloy-steel strength with an 8-inch wide middle stabilizing disc designed to eliminate wobble and handle 30,000 lb towing demands.
In-Bed Base Rail Gooseneck Adapter Plates
If your pickup already has standard fifth-wheel base rails or a hide-a-ball gooseneck pocket, adapter plates provide a fast, non-permanent way to switch formats inside the truck bed.
The Reese Pro Series 25K Gooseneck Ball Adapter Plate drops directly into standard 5th wheel base rails (with 22″ by 10″ tab spacing), securing with four hitch pins to provide an instant 2-5/16″ ball rated for 25,000 lbs GTW. It features a reversible 2″ offset design to help dial in your cab or tailgate clearance. Conversely, if your truck has a square-hole gooseneck system and you need to drop standard fifth-wheel base rails in, the CURT 16310 X5 Gooseneck Mount Kit locks into square shanks to provide standard 20,000 lb-rated rail mounts.
Suspension Systems and Ride Comfort Dynamics
Towing a heavy fifth wheel on rough highways or concrete expansion joints causes significant “chucking”—the push-pull bucking motion that jolts through the truck frame into your seats. How an adapter manages these dynamic forces dictates your overall ride quality.
Air Ride vs. Cushioned 5th Wheel to Gooseneck Adapter for Sale Options
Dynamic cushioning makes long highway hauls far more pleasant while protecting both your trailer’s interior cabinetry and your truck’s transmission.
- Air Spring Systems: Adapters like the Shocker Quick Air utilize adjustable air bladders that absorb the specific back-and-forth forces created during acceleration and braking. By simply increasing or releasing pressure via a standard Schrader valve, you can fine-tune the stiffness based on your exact pin weight.
- Microcellular Polyurethane (SumoSprings): B&W’s adapter utilizes progressive SumoSpring dampers. Unlike traditional rubber that stiffens under extreme cold or loses rebound speed over time, this proprietary material performs smoothly down to -20°F and never requires inflation, puncture checks, or air compressor maintenance.
Rigid Steel Converters vs. Dynamic Damping Systems
Solid, un-cushioned steel adapters (such as traditional kingpin extensions or base plates) transfer road vibrations directly between the trailer frame and truck chassis. While rigid converters offer an affordable, high-capacity solution for farm equipment, short hauls, or commercial tractor-trailers, they can produce a noticeably stiffer ride in light-duty and passenger pickups. If you log thousands of miles annually, investing in a cushioned conversion kit pays for itself in reduced vehicle wear and significantly less driver fatigue.
Compatibility, Clearances, and Installation Guide
Before buying an adapter, you must ensure it matches your pin box bolt pattern, respects truck cab turning clearances, and maintains safe bed rail spacing.
Pin Box Model Identification
If opting for a full replacement pin box, check the manufacturer stamp or decal on your current pin box. Common configurations include:
- Lippert (LCI) 1621 / 1621HD: Found on a wide range of modern fifth wheels.
- Lippert Rhino Box: Features distinctive angled mounting wings common on recent RV models.
- Lippert 1116 / 1716: Often require specific adapter spacer/shim kits for a flush fit.
- FabEx 500 / 503 / 520 / 530 / 560: Supported by custom-drilled replacement assemblies.
For comprehensive fitment lists across multiple hitch types, check out our full towing category breakdowns.
Key Weight Ratings to Check Before Choosing a 5th Wheel to Gooseneck Adapter for Sale
Always confirm that both primary load metrics of the adapter exceed your trailer’s loaded numbers:
- Gross Trailer Weight (GTW/GTWR): The absolute maximum total weight of your trailer when loaded with fluids, cargo, and gear. Most consumer adapters provide ratings between 20,000 and 24,000 lbs, with heavy commercial converters reaching 30,000 lbs.
- Vertical Tongue / Pin Weight: The downward load placed on the gooseneck ball, generally running 15% to 25% of your total trailer weight. Ensure your adapter has a matching 4,000 to 6,000 lb vertical limit.
- Safety Certifications: Look for SAE J-2638 or V19 compliance to verify independent testing for structural stress, cyclic fatigue, and static load endurance.
Cab Clearance and Offset Solutions for Short-Bed Trucks
Short-bed pickup trucks (beds under 8 feet, such as standard 6.5-foot or 5.7-foot boxes) present tight cab clearance challenges during sharp 90-degree turns.
If your trailer’s front nose cap sits close to your rear window, consider offset adapters. For example, Andersen offers an 8-inch offset Ranch Hitch adapter, while Shocker’s gooseneck conversion pin boxes incorporate a built-in 3-inch forward offset. These designs shift the trailer pivot point rearward, keeping your truck cab safely away from the RV cap in gas stations and tight campsites.
DIY Installation and Regular Maintenance Requirements
Most bolt-on replacement pin boxes and direct kingpin couplers can be installed in a home driveway with basic heavy-duty tools:
- Support the Assembly: Use your trailer’s front landing gear and a hydraulic jack or sturdy table to securely hold the pin box weight while removing bolts.
- Torque to Spec: Always use Grade 8 mounting hardware and torque all bolts to the manufacturer’s exact specifications (often between 150 and 210 ft-lbs depending on bolt diameter).
- Verify Bed Rail Height: Confirm that you maintain 6 to 10 inches of clearance between the top of your truck’s bed side rails and the underside of the RV overhang.
- Maintenance Schedule:
- Re-torque all mounting bolts after your initial 100 miles of towing.
- Grease articulating pins and coupler mechanisms every 2,500 miles.
- Inspect latch mechanisms and spray dry lubricant annually.
- For air-assisted systems, verify the bladder operating pressure matches your loaded pin weight prior to every departure.
Frequently Asked Questions About 5th Wheel Gooseneck Adapters
Will using a 5th wheel to gooseneck adapter void my RV frame warranty?
Full pin box replacement adapters (such as B&W or Shocker conversion kits) do not add excessive leverage to the trailer’s structural frame wings and are engineered to maintain safe towing geometry. Under the federal Magnuson-Moss Warranty Act, an RV manufacturer cannot automatically void your warranty simply because an aftermarket part is installed, provided the adapter does not cause the structural defect. However, rigid kingpin extensions that drop straight down can create leverage on lighter pin boxes; always check your RV manufacturer’s specific pin box policies.
Do I need safety chains when towing with a gooseneck adapter?
Yes. Almost all state and provincial transportation regulations legally require commercial and recreational gooseneck ball connections to use safety chains, even if your original fifth-wheel kingpin setup did not require them. Look for adapters with integrated chain loops or install an auxiliary chain kit anchored to the truck’s gooseneck safety chain pucks.
How much truck bed clearance do I need above the bed rails?
You should aim for a minimum of 6 to 8 inches (and ideally up to 10 inches) of vertical clearance between the top of your truck bed side rails and the bottom overhang of your fifth wheel. This space prevents costly bed damage when articulating over uneven driveways, steep fuel station entrances, and rough camping terrain.
Conclusion
Converting your setup from a traditional fifth-wheel kingpin to a gooseneck ball is one of the most effective ways to reclaim your truck bed for daily use while expanding your towing flexibility. Whether you prioritize the plush road damping of an air-ride replacement pin box, the maintenance-free convenience of SumoSpring urethane cushioning, or the rugged utility of a drop-in adapter plate, matching the adapter to your RV’s pin box model and weight profile is key to trouble-free adventures.
At RVing Reviews, we are committed to helping you select safe, road-tested gear so you can tow with absolute confidence. Take time to verify your clearances, torque your hardware to spec, and enjoy the open road with a clear, capable truck bed.