I know that all models are pretty heavy and we will be buying a ram3500drw or silverado 3500drw or f350drw, would the built in air bags in the new rams be sufficient for these heavy campers or should i continue with the firestone airbags that id get for the ford or chevy drw?
It is good that you are considering the weight of the camper and matching it to a truck that can handle that amount of weight. Don't forget to add another 500 or so pounds for your stuff in the camper and also add the weights of people, dogs, etc. that will ride in the truck. Water for the tanks can be calculted at 8.3 pounds per gallon. Duallys are usually well suited for cabover truck campers. The camper will typically ride better on the Ram when the overload springs are just touching. I did that with Energy Suspension Bumpers, inexpensive and a 'do it yourself' fifteen minute job. Torklift makes a similar product.