|Location: ||Washington USA|
|You will probably get lots of opinions, but I glued strips of old inner tube on the trunk floor and slipped the tank in. Cheap and effective. It will not retain water and insulates well. Also, if you get a block of duct seal (a kind of sticky clay-like material we use in industry to waterproof wire openings in conduit) and make a ring of it to stick around the drain opening, it will keep water out of the trunk. John.