Appreciate all the replies, some good info here. The truck is not lifted, totally stock suspension and tires. The 2014 Dodges have coil springs in the back instead of leaf springs so it will not squat under a load nearly as much as the older ones would.
I walked around a large RV dealership today and the tallest one I found was a Forest River Cardinal which was 63" off the ground on what looked like a level parking lot. That one was too heavy to tow with a 2500 anyway. My Dad and I live in different states so I can't pull the truck in there to check. He went to a dealership where he lives and was told it couldn't be done without lifting the trailer or driving with the trailer nose high.