Fifth Wheel Hitches: Ratings, Fixed vs Slider, Rails vs Puck Systems

Both hitch ratings, and the weakest link

Every fifth wheel hitch is sold with a gross trailer weight (GTW) rating and a vertical, or pin, rating. PullRite states that the hitch's weight rating "must be at, or above, the GVWR of your trailer for you to tow safely," and that "the lowest rating of any one component in the system becomes the rating of the entire system."

That last point is why a mounting kit matters as much as the head. CURT prints the same caution under its puck components and its under-bed bracket and base-rail systems in its aftermarket catalog: "Weight capacities limited to the lowest rated towing component." B&W's Companion instructions tell the owner not to exceed the tow or tongue rating of the coupler, of the hitch, or of the truck or trailer.

Figures as printed in each maker's own product documentation and catalog pages; CURT's A-Series product page gives 7,500 lbs. vertical load for the A30 where its kit table says 7,000 lbs. All three makers say their fifth wheel hitches are tested to SAE J2638, which B&W describes as the current standard for fifth-wheel and gooseneck hitches, tested for strength and durability.

Pin weight against payload is what picks the truck

Ford defines payload as GVWR minus base curb weight, and says that when towing, "trailer tongue load or king pin weight is also part of the Cargo Weight." So the pin load lands on the same budget as your passengers, your tools, the generator and the hitch itself. PullRite lists the #2900 at 230 lbs. total; Ram's rating method assumes 250 lb of trailering equipment for a 5th-wheel hitch.

The makers do not agree on how to estimate pin weight before you reach a scale.

Figures from the 2026 Ford towing guide, the 2026 Chevrolet trailering guide, Ram's 2026 HD chart and CURT's Helux manual.

Chevrolet is blunt about the consequence: fifth-wheel kingpin loads are higher than conventional tongue loads, so pay careful attention to the truck's payload capacity and rear GAWR, and subtract added equipment and all passengers other than the driver from payload to find the maximum kingpin load available.

Ford adds that the pin load must not push the truck past GVWR or rear GAWR, and notes those two ratings are on the vehicle's Safety Compliance Certification Label, the sticker in your own door jamb rather than any published table.

How the load path differs from a bumper pull

With a receiver hitch, Ford says the weight-carrying setup "uniformly distributes the trailer tongue loads through the bumper and frame," and Chevrolet describes a conventional hitch as simply a ball mounted to a receiver or step bumper. The load arrives behind the rear axle and is then spread forward.

A fifth wheel hitch does the opposite. Ford says it is "mounted in the pickup bed to put more of the trailer weight directly over the towing vehicle," and describes the fifth wheel trailer as offering improved weight distribution and towing dynamics for that reason. Chevrolet says the bed-mounted hitch positions the kingpin weight near the truck's rear axle.

That difference also sets where the receiver runs out. For the 2026 Ram 2500, maximum tongue weight on the Class V receiver hitch is limited to 2,000 lb, and 2,300 lb on the Ram 3500; a 5th-wheel or gooseneck hitch is required for trailers over 20,000 lb and over 23,000 lb respectively. Heavy trailers also change what you need in the cab, including a brake controller matched to the trailer's brakes.

Mounting: base rails, factory prep packages, single point

There are three ways a fifth wheel hitch gets into a bed, and each one decides which hitches you can buy.

• Industry-standard base rails. CURT says its base rails "accept any 5th wheel hitch with industry-standard mounting points" and are available in 25K and 40K capacities, bolted to a vehicle-specific under-bed bracket kit.
• Factory prep package, the hitch makers' "puck" system. B&W defines it as "a 5-hole towing system that is installed onto the frame of the truck by the truck manufacturer," and says Ford began rolling out towing prep packages in 2010 with GM and Ram following. CURT notes that puck products require a vehicle with a factory-installed prep package.
• Under-bed single point. B&W's standard Companion drops a square post into the 4-inch hole of its Turnoverball under-bed system and leaves a level bed when removed.

Descriptions quoted from each maker's 2026 towing documentation. Ford's guide notes there is no factory prep package on the F-150; Chevrolet's Silverado 1500 pages do not list one either.

If your old hitch is rail-mounted and the new truck has pucks, CURT sells base rail adapters that convert the puck system to industry-standard rails with "no hitch leg reconfiguring or disassembly required." They raise the hitch: 2-1/4 inches on the GM and Ford adapters, 2-3/4 inches on the Ram one.

PullRite takes the other route, selling the same SuperGlide as an ISR Series hitch for rails (#2900) and an OE Puck Series version (#2914) that mounts straight to the factory points with no adapter rails.

Fixed or sliding, and what a short bed really needs

Ford's guidance is about geometry rather than hardware: shorter pickup boxes give less clearance between cab and trailer, and "it's critical that this combination provide clearance between the cab and tow vehicle for turns up to and including 90 degrees," or the trailer can hit the cab during low-speed parking maneuvers.

CURT's rule is simpler. Legs are the standard mounting for an 8-foot bed; on beds under 8 feet, "a 5th wheel slider is recommended." Its catalog gives a check you can run with a tape measure:

1. Trailer width ÷ 2 = X.
2. Distance from truck cab to coupling point = Y.
3. Y − X = Z. If Z is negative, CURT says you need a slider.

Sliders then split into manual and automatic. CURT's S-Series gives 12 inches of coupling-point displacement and "automatically latches in both directions so you only have to exit the truck once," with the driver pulling the handle, setting the trailer brakes and creeping forward until the lock bars engage.

B&W's Companion Slider also moves 12 inches on a lever. PullRite's SuperGlide is fully automatic, with 14 inches of slide during turns and no levers to throw, but it requires a capture plate on the trailer's pin box, so the hitch only tows trailers fitted with that plate.

Two cautions come straight from the makers. CURT's slider sheet says the 12 inches "will not guarantee complete truck cab / trailer clearance when towing." B&W is firmer: the Companion Slider's rear position is for tight turning at maneuvering speed only, because "towing with the slider hitch in the back position places the trailer tongue weight behind the rear vehicle axle which may cause unsafe driving characteristics." Lock it forward before you drive.

B&W also says many short-bed owners tow successfully with the fixed Companion, and lists what decides it: whether the kingpin sits at the front of the trailer or in a recessed or extended pin box, the trailer's width and whether its front corners are square or rounded, and how much sharp maneuvering you expect.

Jaws: what each maker claims

The coupling mechanism is where makers differentiate most, and none of the claims below are independently verified here.

• CURT lists jaw type by series: funnel system on the CrossWing, dual interlocking jaws on the A-Series and PowerRide, a locking bar on the E-Series. It claims the A-Series jaws "fully wrap the kingpin to minimize noise" with a handle that self-resets to ready-to-couple, and that the E16 "automatically locks for easy, secure coupling" using a single handle with few moving parts.
• B&W says Companion jaws are machined to fit the coupler precisely, with a tolerance of +/- .002 of an inch in its owner's manual, and that a cam prevents the jaws opening while the handle is closed.
• PullRite claims a patented fully automatic locking jaw with "the only self-locking handle on the market," no secondary locking device to engage, and jaw components that cradle the kingpin 140 degrees.
• Ford's accessory 5th-Wheel Hitch Kits, rated 20,000 and 35,000 lbs. GTW, have a forged jaw, 10° front-to-back and 6° side-to-side pivot, and 15-inch to 18-inch height adjustment. They require the prep package and are only compatible with 8-foot beds.

Gooseneck or fifth wheel for an RV

Ford splits them by use: goosenecks are "commonly used for horse and other agricultural trailers," fifth wheel hitches "are commonly used for RV trailers." No manufacturer document reviewed for this page ranks one above the other for safety, and we are not going to invent a ranking.

Where the makers genuinely disagree is hitch position.

Each statement is the maker's own, in its own documents. Follow the instructions that came with your hitch and your truck.

Converting a fifth wheel to tow on a gooseneck ball means changing the pin box, and that is where warranties bite. Lippert, which builds many RV frames, states in its aftermarket pin box guide that replacing the OEM pin box with one whose distance from the front row of mounting bolts to the kingpin exceeds the OEM specification "may result in denial of warranty coverage," and strongly discourages fitting a pin box rated below the trailer's GVWR.

Its own Gooseneck Connect 21K pin box is described as "a safe and LCI-approved method" of converting a Rhino pin box-equipped trailer to a gooseneck hitch. CURT's catalog says its Helux gooseneck pin box, up to 20,000 lb capacity on a standard 2-5/16 inch ball, is "approved on Lippert RV frames (will not void warranty)," which is CURT's statement about its own product.

Hitch makers also split over rotating pin boxes. CURT says its A-, E- and PowerRide series work with Sidewinder or Turning Point pin boxes when a CURT wedge is fitted.

B&W says a wedge is acceptable on its four-point puck-mounted Patriot and Companion models but should never be used with the Turnoverball-mounted Companion or Companion Slider, because "the forces generated at that single attachment point by a wedge device can damage the hitch and cause it to fail." More broadly, B&W does not recommend any product used with its mounting system that B&W has not made and tested, and says doing so voids its warranty.

Installation: what the instructions actually say

Chevrolet gives the structural rule: follow the hitch maker's directions, but "the hitch must be attached to the truck frame. Do not use the pickup bed for additional support."

For base rails, CURT's manual says each end of each base rail must connect to the vehicle's frame, each frame bracket must be secured with two bolts unless the optional weld is used, and holes in the chassis frame need a 17/32 inch drill bit, with a check for fuel lines, brake lines and structural members before drilling.

CURT rates that job "Moderate" and states that "the installation is the responsibility of the installer and the owner." Vehicle-specific under-bed brackets reduce or eliminate frame drilling; semi-custom brackets all require drilling, and universal brackets require drilling or welding.

A puck install is a different afternoon. CURT rates its #16024 puck legs "Easy" and gives three steps: drop the product into the bed pucks, close the anchor levers, secure the levers with the attached safety pins. B&W describes its Companion OEM base the same way, drop in, turn the handle, pin in place.

Bed liners decide whether rails can go down at all. CURT says not to install base rails over plastic bed liners, which must be cut out of the way, while a spray liner is acceptable; PullRite says the same, with other liners needing an opening cut so the rails sit against the metal of the bed. Ford's accessory hitch kits cannot be used with drop-in bedliners or bed mats.

No maker document reviewed here requires a professional installer. B&W comes closest, stating that adding components to a vehicle chassis can be hazardous and "this installation must be completed by someone who is aware of the hazards involved." RVPlainly's own advice goes one step further: drilling the chassis frame and fitting under-bed brackets is a job for a hitch installer, because a misplaced hole near a brake line or a bracket bolted to sheet metal instead of frame is a failure you find out about under load. Dropping legs into factory pucks is a driveway job. Frame work is not.

Whatever you fit, the combination still has to be loaded and driven within the ratings; NHTSA's towing guidance is the plain-language starting point, and the detailed figures for a given truck sit in its own towing guide, as with the F-250's conventional and fifth-wheel tables.

Common questions