We have a 2012 f250 short bed with a "full metal jacket" rolling bed cover, added a 37 gal Transfer Flo fuel tank that fits under and around the cover. I went with this tank because it is completely automatic and does not mess with the truck's computer. The aux tank fills the main by reading the fuel gauge, when the main gets to a quarter tank the aux automatically pumps fuel to the main till it reaches three quarters. The bed cover will lock into position covering the tank to protect from fuel theft. When not towing I pull the cover closed and locked protecting whatever happens to be in the bed (generators, snow skis, etc.), I love the tank and bed cover!