As standard, the trailer comes with 2 short pins for this purpose. When the trailer isn’t housing the boat, the pins are used to mount the lightboard into the rear risers. Push the risers to a vertical position, and the pin will slide through the hole in both the lightboard and the riser. The 2 spare pins are located next to the long pins in the wheel housing.

When the boat is loaded, each fitment is individual to your boat/motor setup, but you may be able to hang it off the back grab rails of your boat. Alternatively, clients have had success using railblaza mounts (available at most camping stores).