hey brett,
for me i have a hobie outback and i have placed some heavy duty magnets to the inside of the hull. (the outback has a ledge on the sides.) then i have attached two strips of metal, the ones you get from hardware stores that are used for support about 1.5" x 8" in size. duct taped it to the bottom of the boxes. these sit ontop of the magnets and they don't move not even going through the surf.
on the other side of the hull i have attached a slotted tray from target. i use these for my jacket or lunch so that it will be up off the floor and keeps it from sliding around.
with the boxes out of the sunlight i think it would help with the moisture from accruing in the boxes. if you try it let me know what your results are.
tim
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