If you have a large boat, then you will need to have a tandem boat trailer. Tandem trailers have double axles, meaning that they can spread the weight more evenly over the whole of the trailer. They are also less likely to have problems with handling, so you will not get the troublesome "fishtail" effect, which is a problem for single axle trailers. Setting up a tandem axle boat trailer can be difficult, as you will need to adjust it to fit the right dimensions of your boat.
Step 1 - Locate the Correct Settings
Before you can set up the tandem boat trailer, you will need to know the exact specifications for your boat. Look in the owner's manual for your trailer for the correct specifications. If you do not have the manual, then you may search for the information online as another alternative.
Step 2 - Change the Supports
Once you know what the specifications are for the tandem boat trailer, you should start adjusting the axle supports. This will involve changing the heights of your bunk supports and possibly even adjusting the position. Use a wrench to change the height until you are satisfied.