F250 Short Bed Adding Diesel Auxiliary Tank

I put a 41 gallon tank in my 2012 short bed F250. The filler neck is just above the rails. I have over a foot between the 5th wheel and the tank, just in case I ride the pin over the 5th wheel. My 5er is light on the pin and I am still about 300 pounds under on weight. My tank is offset all the way to the passenger side, to haul a 2 person kayak when not towing.

Now I can drive all day, and only have to fuel once. Cured my range worries.