Thank you for your response Fox20hunter. This is what I was in search of. May I ask what gearing did you have in the 350 that you are comparing to? And, what kind of mileage are you achieving with 450 loaded and empty. I have a RW427 which grosses at 20,000, and is fairly heavy on the hitch weight. With my current vehicle, which I purchased in anticipation of buying the 5th wheel, I am exceeding the labeling of the truck. It pulls it well, with air bags it levels up easily, but if I were to be in an accident I don't know where I would stand legally, and I love the appearance of the 450, just concerned about use when not towing as it would be my daily driver for my short commute to work and to play too. Only silver lining is short commute daily.