This may be a stupid ass idea, but even though I'm diehard into juice, I like what you "airheads" are doing too. (That's not derogatory is it?) Anyway, though, has anyone thought of a false floor in the rear of their car/truck? Basically a custom airtank shaped like the floor of their trunk. A 3" false floor that's around 1.75 cubic feet is 12 gallons. Not sure if it's been done, but I think it would be worth losing 3" - 4" of floor space to nix your current tank AND increase your capacity to over 20 gallons easily. Am I crazy?