Well, I just purchased a Ram, 3500 DRW, long bed and I installed the B & W 3600 5th wheel hitch. The truck sat higher than my old truck that was an F-350.
I was a little concerned about the difference until I backed up to the trailer. I didn't measure the squat in the Ram, but I'm guessing it squatted 1 1/2 - 2" when I lowered the trailer down on the truck. I'm very satisfied with the way they match up.
When I installed the hitch, I installed it at the medium height, so I could lower it to the lowest level if I wanted, but I think the medium height will be just fine.
I think you'll be very satisfied with a B & W hitch for the Ram truck. It fit very well and man is it stout. I'm very happy with mine.