How you install a boat trailer bracket depends on a few things. If you’re replacing worn-out brackets, simply copy the position of the old one using a new bracket and new hardware. Do not try to reuse nuts and bolts; although they could still be usable, it is best to replace them. For new installations, purchase the correct mounting U-bolt, and the hardware to match it. Be sure your positioning will not interfere with the trailer jack, winch, or launching or retrieving your boat.