multiple purposes, what kind of RV?

that's a hard one. your Durango is essentially the same as my jeep WJ. that towing capacity is more than you will ever need. the thing you run out of is the 1000 payload. not sure how big you are but a family of 4 in the vehicle with fuel, weight distributing hitch and sway control plus and some gear eats up tongue weitght FAST. I have an older prowler 19E. it could sleep 4 and will as my kids get bigger (me and the wife with a 2 year old and a baby coming this june) but I am very cautious with my load, I have pulled out the fresh water tank and pump and keep packing to a minimum. The Jeep handles it but its not a fun tow. I am at capacity for sure. Highly recommend going truck if you can. Or if your willing to give up the winter camping go pop up or htt. (if it weren't for the wife I would be pop up only. so much more bang for your buck they tow like there not even there with an suv and a 10 foot box gets room for 8 when setup plus they can handle offroad way better)