First you need to look at the GVWR and the pin weight of the trailer. Then you will need to look closely at the GCWR and payload capacities of the trucks. An F350 dually may well work. But only the numbers all tell for sure.
For six people you will need a bench front seat. You don't see too many trucks in the higher trim packages with bench seats. So you may have to do some searching if you are looking for all the bells and whistles. Or order what you want.
Most private RV parks have at least some spaces for a 40 footer. But often not many. And if you are interested in national, state, COE, city, etc parks you can be limited.
