How to Properly Adjust the Bunks on a Boat Trailer?

Last Updated on October 3, 2022

Do you own a boat trailer? If so, do you know how to adjust the bunks for proper loading and unloading? Boat trailers can be a great way to transport your boat, but only if they are adjusted correctly. 

The right way to adjust the bunks is to first loosen the bolts that hold them in place, then adjust them to the correct height and re-tighten the bolts.

So, whether you are a seasoned boater or just getting started, read on for tips on how to properly adjust your boat trailer!

How to Fit Your New Trailer to Your Boat?

Here are some tips on how to properly adjust the bunks on a boat trailer.

  • Park the trailer on level ground and set the emergency brake.
  • Loosen the bolts that secure the bunks to the boat trailer frame with a wrench.
  • Adjust the bunks so they are positioned evenly along the length of the boat hull.
  • Tighten the bolts to secure the bunks in place.

How Should Boat Rest on Trailer?

Assuming you are talking about how a boat should sit ON a trailer: The answer may vary depending on the size and weight of your boat, but in general, you want the bow of the boat to be higher than the stern. This will help with both aerodynamics and stability when towing.

You also want to make sure that the boat is centered on the trailer so that it tows evenly. Overloading one side of the trailer can cause problems.

How Far Apart Should Bunks Be on a Boat Trailer?

Bunk spacing on a boat trailer is important for two reasons: safety and stability. Too close together and the bunks can collapse, too far apart and the boat can become unstable. The general rule of thumb is that bunks should be no more than 12 inches apart.

This gives enough space for the bunks to support the weight of the boat without collapsing, while also keeping the boat stable on the trailer. Of course, there are always exceptions to the rule. If you have a particularly large or heavy boat, you may need to increase the bunk spacing to 16 inches or more.

Conversely, if your boat is on the smaller side, you may be able to get away with less than 12 inches between bunks. Ultimately, it’s up to you to decide what bunk spacing works best for your boat and trailer combination. Just make sure that safety and stability are your top priorities when making your decision.

Should Boat Trailer Bunks Be Level?

Boat trailer bunks should be level in order to provide proper support for your boat hull. If the bunks are not level, your boat may sit unevenly on the trailer and this can cause problems when launching or retrieving your vessel. 

Additionally, unlevel bunks can also lead to premature wear and tear on both your boat and trailer. Therefore, it is important to take the time to ensure that your bunks are properly level before each outing.

How to Properly Adjust the Bunks on a Boat Trailer?

Where Should Trailer Bunks Sit on a Boat?

Most boat trailers have four bunks, two on each side. The front and rear bunks should be positioned so that they support the hull at the widest points. This is typically around 24 inches (61 cm) from the centerline of the trailer.

The front bunk should be placed just behind the bow eye, and the rear bunk should be placed just in front of the transom. The side bunks should be placed so that they are level with each other when the trailer is sitting on a flat surface. 

This will help to keep your boat balanced when loading and unloading. You may need to adjust the position of the side bunks depending on the size and weight of your boat. It’s important to make sure that all four bunks are supporting your boat evenly. 

If one side is lower than the other, it can cause your boat to tilt when loading or unloading. This can damage both your boat and trailer.

Should Boat Trailer Bunks Move?

If you have a boat trailer with bunks, you may have wondered if the bunks should be able to move. The answer is yes, the bunks should be able to move. This is because when you are loading or unloading your boat, the weight of the boat can cause the trailer to shift.

If the bunks are not able to move, this can damage your boat or make it difficult to load and unload. 

There are a few things to keep in mind when adjusting your bunks. 

First, make sure that the front of the bunk is higher than the back. This will help keep your boat from sliding off of the trailer while you are driving. 

Next, adjust the side-to-side position of the bunks so that they are centered under your boat’s hull. 

Finally, make sure that all of the bolts and nuts are tight so that everything stays in place while you are on the road.

How Should a Boat Sit on a Trailer?

When loading a boat onto a trailer, it’s important to make sure the boat is properly positioned. The front of the boat should be lined up with the center line of the trailer, and the back of the boat should be about 18-24 inches from the rear edge of the trailer. 

The side-to-side positioning is less critical, but you’ll want to make sure the boat is centered on the trailer before securing it in place. Once everything looks good, start by tying down the front of the boat to keep it from moving around while you secure things in the back.

How Do You Adjust Bunks?

Most bunks can be adjusted to fit the needs of different people. The most common type of adjustment is to raise or lower the top bunk. 

This can be done by removing the mattress and using a wrench to loosen or tighten the bolts that hold the frame in place. Some bunks also have ladders that can be moved up or down to make it easier to get in and out of the bed.


Properly adjusting the bunks on your boat trailer is essential to ensuring that your boat travels securely and safely. It’s also important to make sure that the bunks are adjusted correctly every time you use your trailer, as even a small change in weight or height can affect how your boat rides. 

By following these simple steps, you can ensure that your next boating trip is a safe and enjoyable one. Have you ever had to adjust the bunks on your boat trailer? What tips would you add?