Upgrading fuel capacity

I've had a Transfer Flo 50 gal in bed tank in my trucks since 03. I wouldn't be without it. People can say what they want about having to stop sooner than that but having the ability to fuel up where it's cheaper and bypass where it isn't is worth it. At times I've seen as much as $.40-$.50 per gal difference from one area to the next. 800 -1000 mi between fuel stops can make a big difference in price

I replaced factory tank w/ a Transfer-flow 50 gallon. No problem working underneath truck. The T-flow is made from metal while the Titan is made of plastic. Both have their advantages/disadvantages. If you go w/ T-flow, make sure you get the "undercoating" option for it. Will take a few hours to replace and a helper is good to have along w/ a floor jack and wood. Tight squeeze getting your hand on top of tank to re-attach the wires and all. Based on 9-10 mpgs towing, good for about 400 miles before needing fuel tho 10 gallons remain. Figure that's a reserve.