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I wonder how those little points of contact on the Dri-Dek would affect the bottom of the tank. On the other hand I have a 10 gallon bait tank on a piece of Dri-Dek and it works fine. On the third hand if the little points of contact would wear a hole in the bait tank, the water leaking out won't explode. On the fourth hand, the polyethylene material used for the tank is probably harder than the Dri-Dek material and there wouldn't be any movement anyway. The Dri-Dek is about a half inch thick so make sure you have the room and won't block the fuel fill cap removal.