Depends on how you want to install it. I have seen some people use a fuel cell, with the filler door in the bed of the truck.

But another tank that might work pretty slick is one for a 1969 Firebird/Camaro. It's not a real deep tank, but holds 16 or so gallons, and has an extended fuel neck out to the rear that could be positioned so that it's under the tailgate. That's what I'm going to try to use.


52 GMC 3/4 ton pickup
68 Big Block Vette
68 455 Firebird