[special-K]

Sounds like a bad idea all around. Seems like a great way to accumulate condensation to feed the ethanol, a mile of filler that could leak, need to account for body to frame as well as cab to bed and bed to frame movement. And if you go through the floor, how much fall can there be to way back at the fuel tank. If you've ever had a square body or newer truck you know how onry they can be to fill sometimes, due to the path not being so direct. Maybe it's just diesel in the cold, but nothing sucks like standing in the cld blowing wind with a pocket full of gas money, a job to get to, and the truck will only let you dribble the fuel in while hand freezes because it won't let you set the trip lever