buying used 5th wheel

As per my signature, we have a similar truck, and ours is F4x4 and had it weighed at close to 8k pounds. We have the pull rite super glide and it is serving us well. Our camper has the rounded cab, but we cannot make 90 degree turns or it will still bumb the truck cab. We have a little dent to prove it. ??. After visiting many dealerships for many months, not a single salesman ever suggested to us that what we could haul is different than what we could tow. Through this forum and other google searches we learned this important fact on our own. Our Durango is the 1100 series, rather than the 2500 series (heavier ), which salesmen said we could easily tow. We recently went through the Poconos/Adirondacks and the truck,performed well. We did have airbags installed, and it rides quite comfortably. If we ever upgrade, we would definitely get a heavier truck,but are doing fine for now.