Like Ess505 I decided to go with a Aux tank. Mine gravity drains into the main tank. I have the ATI Tank Aux46. So I have 77 gallons total. I’m good easily for 700 miles and I’ve went 600 between campgrounds. When I get setup at the campground, I find the cheapest diesel and fill her back up.
It gives me around 1400 miles between fill ups not towing. The tank only weighs 56 pounds. So it’s around 370 lbs fully loaded but I’ve never put more than 40 gallons and normally I run 30.
Best thing I’ve ever bought for the truck.