We have the transfer flow 50 gallon in our 2016 Ram. Sits in the front of the bed, the bed cover goes right over it when we aren't pulling the 5er. Doesn't get in the way of the hitch. We don't use our truck for anything else except the trailer so our hitch never comes out. But It's all computerized and adds fuel when the system says too. Cost a little more than others but it frees you up from worrying to shut off pump in time or guess how much fuel is left and what not.
We have used transferflow in our last two trucks and love them.
Pay the extra for a price of mind and easy install.