transfer flo makes an in bed ank for the short bed that works with a 5th wheel. i have the 57 gal replacement tank for 3 years and boone has ever noticed that the rear of the tank sticks down an inch. i have the 100 gal in bed tank. 157 gal total. sure saves a lot of money fueling up where the fuel is cheaper. i added the fasss fuel filter system and have all the fuel go through it before it goes to the oem filters. the fass filters ae hard to find. if anyone gets their system, get a spare set of fiters an take them to a truck parts store and let them find the replacements. lots cheaper,,fass overcharges bad for them. and the numbers on them will not cross reference with anyones filters.