What causes chucking or bucking with a fifth wheel hitch?

Chucking is that jarring back-and-forth motion when starting, stopping, or going over bumps. Common causes are play between the kingpin and hitch jaws, a rigid stock pin box passing every jolt straight to the truck, and the trailer's own suspension. Solutions include replacing worn jaws or bushings (few current RV hitches have a jaw adjustment), upgrading to a pin box with cushioning or air-ride suspension, or having the trailer suspension checked.

My fifth wheel hitch won't release - what do I do?

First, chock the trailer wheels and lower the landing gear until it takes the trailer's weight off the hitch plate, but don't lift the pin box clear of the plate. CURT says any gap should be 1/16 inch or less, and jacking too high puts upward pressure on the jaws and binds them. Then back the truck up slightly against the kingpin to take the load off the jaws, set the parking brake, and try the release handle again. Still stuck? Raise or lower the landing gear a little and retry. Lubricating the release mechanism with penetrating oil can help. Never force the release.

Why won't my fifth wheel hitch lock onto the kingpin?

The hitch jaws may not be fully open — check the release handle is in the coupling position. The trailer may be set too high. On most hitches the pin box plate should sit about 1/2 to 1 inch below the top of the hitch plate before you back in; too high and the kingpin can ride up onto the jaws (a high hitch) and look coupled when it isn't. With the landing gear still down, pull forward, reset the height, and back in slowly and firmly. The jaw mechanism could be dirty or corroded — clean and lubricate it. In rare cases, the kingpin size may not match your hitch (standard is 2-inch diameter).

Why won't my sliding hitch move?

Check that the locking pins or handles are fully released. Line the truck and trailer up straight on level ground; if the handle is wedged in its latch hole, easing the truck slightly forward or back frees it. A manual slider moves when you set the trailer brakes and slowly drive the truck, not by hand. An automatic slider (PullRite SuperGlide, Demco Autoslide) has no trigger; it works off capture plates, so check those. If the slide is dirty or rusty, clean it, then lube it only the way your manual says: B&W's Companion Slider needs no lube, and a current SuperGlide takes light oil only, never grease.

How do I fix squeaking on my fifth wheel hitch?

Squeaking is almost always a lubrication issue. Apply fifth wheel grease to the entire hitch plate surface (unless your hitch uses a lube plate instead, or its manual says no grease, as Reese's R20 and PullRite's SuperGlide do). Also grease the pivot points on the hitch head, the jaw mechanism, and any moving parts. If squeaking persists after thorough lubrication, inspect for metal-on-metal contact points that may need adjustment or replacement.

Is it normal for a fifth wheel hitch to be noisy?

Some minor noise is normal, especially over bumps or uneven terrain. However, constant clunking, loud popping, or persistent squeaking indicate a problem — usually insufficient grease or worn components. A properly lubricated and maintained hitch should be relatively quiet during normal driving.

Troubleshooting Common Problems

Q: Why is my fifth wheel hitch making noise?

The most common cause is insufficient lubrication on the hitch plate. Apply a generous coat of fifth wheel grease (if your hitch runs a lube plate instead, check the plate for wear rather than greasing over it). Other causes include worn jaws allowing play around the kingpin, loose mounting bolts, or a worn skid plate. If greasing doesn't fix it, inspect the jaws for wear and check all bolts for proper torque.

Written by a towing industry expert Updated September 2026

The short answer: Clunking, binding, or won't latch? Work through the most common fifth wheel hitch problems.

Why Is My Fifth Wheel Hitch Making Noise?

Clunking, squeaking, popping

Clunking When Starting/Stopping

Cause: Slack between kingpin and jaws. Normal with some hitches, but excessive play means wear.

Fix: Check jaw adjustment if your hitch has it, though most current RV hitches don't (older Demco Hijackers did). If the jaws are worn, a replacement jaw kit usually tightens things back up.

Squeaking When Turning

Cause: Dry skid plate. Metal-on-metal contact.

Fix: More grease on the hitch plate. Apply liberally and re-check after a trip. (Running a lube plate instead of grease? Check the plate for wear rather than greasing over it.)

Popping/Snapping Sound

Cause: Often the pin box pivoting on a dry hitch plate, or something flexing in the trailer itself.

Fix: Grease the skid plate. If it persists, the sound may be from the trailer, not the hitch.

What Causes Chucking or Bucking with a Fifth Wheel?

Jerky ride, especially on rough roads

Chucking is that jarring back-and-forth motion you feel when the trailer and truck aren't moving together smoothly. It's uncomfortable and hard on your truck.

Cause 1: Kingpin Play

Fix: Tighten jaw adjustment if available. Some play is normal, but excessive play causes chucking.

Cause 2: Standard Pin Box

Fix: Upgrade to a cushioned or air-ride pin box. These absorb the motion before it reaches your truck. Popular solution for chucking.

Cause 3: Trailer Suspension

Fix: Sometimes it's the trailer, not the hitch. Have the trailer suspension checked.

Pro Tip

Air-ride pin boxes (like Reese's 5th Airborne or Lippert/CURT's Air Ride and Flex Air) are the most effective solution for chucking. They're not cheap (roughly $1,300-2,100) but they transform the ride. MORryde's pin box uses a rubber spring instead of air and costs less.

What Do I Do If My Fifth Wheel Hitch Won't Release?

Kingpin stuck in jaws

Don't Panic

This is almost always fixable at the campsite. Don't try to drive or drag the trailer — you'll damage something.

Step 1: Check the Obvious

• Is the safety pin/clip removed?
• Is the handle fully in the release position?
• Is there weight on the hitch? (jacks not supporting trailer)

Step 2: Remove Weight from Kingpin

Extend the front jacks until they take the trailer's weight off the hitch plate, then stop. Don't lift the pin box clear of the plate: CURT says any gap should be 1/16" or less, and jacking too high puts upward pressure on the jaws and binds them.

Step 3: Back Up Slightly

With the wheels chocked and the jacks down, back the truck up slightly against the kingpin to take the load off the jaws, set the parking brake, then pull the handle. That's the fix Reese, CURT and PullRite all give. Still tight? Raise or lower the jacks a little and try again.

Step 4: Drive Forward Slightly

With the jacks down, the tailgate down and the handle fully in the release position, pull forward slowly; the jaws open as the kingpin leaves. If you feel resistance, stop and go back a step. Don't drag the trailer on its jacks.

Step 5: Lubricate

Spray lubricant on the jaw mechanism. Work the handle back and forth.

Still stuck? Call a mobile RV tech. Don't force it and break something.

Why Won't My Fifth Wheel Hitch Lock?

Indicator doesn't show locked

Kingpin Not Fully Seated

Fix: With the landing gear still down, pull forward and start over. Set the trailer so the pin box plate sits about 1/2" to 1" below the top of the hitch plate, then back straight in so the kingpin slides into the jaws. On a standard jaw-type hitch, never lower the trailer onto the hitch with the jacks: the kingpin can end up sitting on top of the jaws (a high hitch) and the trailer can come off.

Debris in Jaws

Fix: Check for rocks, sticks, or ice in the jaw area. Clean it out.

Mechanism Stuck

Fix: Work the handle several times. Apply lubricant. Check for rust or binding.

Worn Components

Fix: If nothing else works, the locking mechanism may be worn. Time for service or replacement.

Never Tow Without Verified Lock

Verified means all three: no gap between the pin box plate and the hitch plate, the jaws visibly closed around the kingpin (use a flashlight; don't crawl under the trailer), and a pull test against the trailer brakes with the landing gear still down or just off the ground. An indicator alone isn't enough. If any check fails, don't tow. Period. Fix it first.

What If My Sliding Hitch Won't Slide?

Stuck forward or back

Pin Not Released

Make sure you've fully released the locking pin. Some have two — check both.

Truck and Trailer Not Lined Up

Sliders bind when the truck and trailer sit at an angle or on uneven ground. Straighten out on level ground, and if the handle is wedged in its latch hole, ease the truck slightly forward or back to free it. Then set the trailer brakes and move the truck slowly.

Dry Rails

Lube the slide only the way your manual says, because brands disagree: B&W says its Companion Slider needs no lube at all, Reese calls for grease or Teflon lube on its slide tubes, and a current PullRite SuperGlide takes light oil only, never grease.