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How To Adjust Boat Trailer Bunks

How To Adjust Boat Trailer Bunks
January 10, 2016 Roxom

How To Adjust Boat Trailer Bunks

Like your boat; your boat trailer’s bunks, the Plastic, PVC or Carpet adjustable skids the boat sits on while on the trailer will occasionally require adjustment’s to carry the load of your boat properly.

When your trailer bunks are adjusted correctly, your boat will ride on the trailer’s keel rollers correctly where the majority of the boat’s weight is concentrated. Because the keel roller’s consume most of your boat’s weight, the bunks can be moved easily without moving the boat off the trailer.



  1. Firstly, inspect the boats keel, you want to ensure that the lowest part of your boat is resting on the line of rollers down the center of your boat trailer. If your boat is not sitting correctly, use an adjustable wrench to loosen the bolts that hold your keel rollers in place. Make sure you start at the front of your boat, raise your keel roller until it is touching the keel of your boat. once the first roller has been adjusted repeat the process moving down your trailer until all rollers are now touching the keel of your boat. After your initial tightening with the adjustable wrench you can use a torque wrench to torque the bolts to the extent which your boat trailers operating manual specifies. Your boat will be resting on the bunks while you make the roller adjustments, so no further modifications to the bunks will be necessary in this process.
  2. Next, adjust your trailer bunks only if your boat is setting on the keel rollers but is a tad ‘wobbly’ on the boat trailer. you can use your wrench to loosen the bolts that hold the bunks brackets in place on your boat trailer.
  3. Start at the most forward point of the bunk, raise the bunk until it touches the bottom of your boat and tighten until the bunk is in place. Repeat this step moving down your trailer until all of the bunks are touching the bottom of your boat, and are secured in place.

boat-trailer-bunk-adjustment Boat Trailer Ribbed Bunks Angled

Tips and Precautions:

  • Each time you take your boat off the trailer, check the stability of your trailers bunks. If out of place adjust them when necessary to maintain top performance of your boat trailer’s bunks.
  • When making adjustments to your trailer bunks, Despite the majority of the weight is supported by your boats keel rollers. NEVER place your fingers between the bunks and the boat.
  • Constant driving over bumps and pot holes along the road will eventually cause your trailers bunks and keel rollers to eventually loosen. Be sure to make constant checks and adjustments to your trailer to avoid damage, injury and lose of performance.
  • To view our range of premium boat trailer parts click here.


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