I have a 2017 Ram 3500 Tradesman with 4wd and 6.7 Cummins Turbo. My fuel tank is I think 32 gals. My guess is when towing, I will have to stop for fuel EVERY day. I could live with every day and a hal...
We had our55gal inbed tank built at the KSH factory in Lake havasu Az in 06. Really like what It does for us. Our truck is a towing only so the inbed tank might not work for others.