We are in agreement with Glazier, that a 3/4 ton diesel works well with the 337RLS (see vehicles in signature). Since last May, we have traveled 25,000 miles in our truck, and I know that at least 60% of those have been towing our Reflection through all the Rocky Mountain states and some mountainous terrain in the East. We are close to full-timers. I owned a Chevrolet dualie (gas 8.1) previous to our Dodge, and if we were buying our truck again, knowing of our decision on a fifth wheel, we would have chosen a 1 ton dualie. It would give us more reserve capacity now and other options down the road. I do think that like towing a fifth wheel, adjustments are needed when going to a dualie, but can be made!