The hitch in the bed is a separate rating from the truck's payload and from the trailer's GVWR. This check is about whether today's hookup actually locked, and whether the trailer will clear the truck. It is not a tow rating. The towing check still needs the sticker numbers, and the pin-weight guide is how that pin spends payload.
Two public manuals are specific enough to follow without inventing a third procedure. B&W's Companion steps below are from the RVK3305 installation instructions. PullRite's steps are from the SuperGlide 4100 and 4400 owner's manual. If your hitch is a different brand, or a different model, use that manual. Do not mix the handles.
King pin, jaws, and the pin that keeps them shut
B&W's Companion instructions say to remove the safety pin from the coupler handle and open the handle. Set the trailer so the king pin plate is slightly lower than the top of the coupler. Back up with the king pin centered until it engages the jaws. Close the handle and put the safety pin through the handle and the coupler. Connect the brakes and the lights before towing.
A handle that looks closed, with the safety pin still in your hand, is not the step B&W printed.
PullRite's SuperGlide manual says to keep the king pin clean and free of rust, with a light lubricant. Hitching, in that manual, starts with the truck and trailer aligned within 16 degrees, the trailer wheels blocked, and the lock jaw open. You lower the tailgate for that procedure. You stop about 6 inches before the capture plate, and you set the front of the trailer so the bottom of the capture plate meets the ramp on the hitch plate. PullRite says skipping that height step can keep the king pin from locking.
PullRite's check that the jaw closed is specific. The king pin has to be fully in the slot or the lock jaw will not seat, and the handle catch will not engage. PullRite says to try to pull the release handle without lifting it first. If it comes out, it did not latch. PullRite also says not to trip the lock with your hand. Use a probe if you are looking at the mechanism, and do not stand between the truck and the trailer while hitching.
High hook
PullRite names the failure. High hooking, in that manual, is backing the hitch into a trailer that is set too high, so the lower flange of the king pin wedges against the hitch instead of entering the lock. PullRite says that can damage the lock jaw.
B&W's "slightly lower than the top of the coupler" is the height that keeps the pin dropping into the jaws on that hitch. Too high is the miss. Too low, and the plate is not meeting the hitch the way that step describes. Look at the pin in the jaws before you put the safety pin in. Then look again after the truck has taken the trailer's weight and the landing gear is unloaded. A jaw that was closed on the way in can still be wrong if the pin never went all the way down.
Cab, bed, and tailgate
PullRite's SuperGlide is a short-bed hitch. The manual says the king pin's distance from the nose of the trailer decides whether that hitch can move the trailer back soon enough to clear the cab. It tells you to call PullRite with the trailer width, the truck, and that measurement if the pin sits back under the nose. It also says a turn past 90 degrees will bring the trailer into the truck.
The clearance test in that manual: pull forward and turn slowly, with someone outside watching the gap. The distance between the cab and the trailer should be greater than two inches at every point in the turn, including when the trailer corner is nearest the cab and when the turn nears 90 degrees. PullRite says that two inches is for normal driving, and that a dip in the road can close the gap.
The same manual asks for a minimum of 6 inches between the bed rails and the underside of the trailer, so the hitch can tilt. You set that with the pin box. It also says to keep the breakaway cable and the 7-way cord from catching in the moving hitch, and it prefers the cord isolated back toward the tailgate. A cable that snags can pull the breakaway pin. The breakaway guide is what that pin does.
B&W's Companion owner's manual tells you to check clearance between the fifth wheel and the sides of the bed, and to allow several inches so uneven ground does not make them touch.
Ford's 2026 Super Duty towing information includes a tailgate-clearance note for fifth-wheel and gooseneck towing. The note says maximum tailgate height varies with configuration, options, and tire size. A number from that table is not a measurement of your tailgate. Lower the tailgate when your hitch manual says to, and look at the gap yourself.
A short bed does not automatically need a slider, and a slider does not replace the clearance test. The door-sticker guide is why the bed length on the truck changes the leftover payload. It does not measure the cab.
If the handle, the jaw, or the safety pin does not match the manual for the hitch you own, stop. A pin that only looks latched is still just a pin.
Questions people ask
- What is a high hook?
- PullRite's SuperGlide manual says it is backing into a trailer set too high, so the king pin's lower flange wedges on the hitch instead of locking in.
- How much cab clearance does PullRite call for?
- That SuperGlide manual says more than two inches between the cab and the trailer through the turn, watched by someone outside the truck.
- Does every hitch use the same handle?
- No. B&W's Companion instructions use a coupler handle and a safety pin. PullRite's SuperGlide uses a release handle and a lock jaw. Use the manual for the hitch in the bed.