I have a 2014 Long bed Ram Longhorn 3500 6.7 Aisin 4:10 and I pull a fiver. I have a 60 gallon aux. Fuel tank mounted with a B & W hitch in the Ram factory mounts. Between the fuel tank and the hitch base I have 15 inches of clearance. If I remember right it is 20 or 21 inches from floor to top of bed rails. There is more space between the hitch and the tailgate. The fiver I have on order has a 100 gallon fresh water tank and a 12 gallon water heater hence 112 gallons of water on board. Most fivers have a decent size fresh water tank. As far as the generator I have a 6500 Onan, inverter and 4 6volts on the next unit. Look over the specs on the unit you want to buy and you may be surprised. There is a lot of difference between a TT and a Fiver.
