Here is what we experienced. We have what is considered a half ton towable (lightweight) 5th wheel. We were at 11,000 Pin weight was acceptable but in real world driving I felt two main issues. 1, the brakes on the truck felt a bit inadequate, they worked but I felt I was pushing it and tried to make it up with trailer gain. 2. 5.3 liter gas engine was working too hard on hills. Seeing we were planning on spending a lot of time in the rockies and Alaska it was decided to go 3/4 ton with a diesel. It was a good move as I can literally fly up steep grades, I do not have to use any of the truck lanes as I can easily maintain the speed limit. Using the built in diesel brake features reduces the amount of braking that needs to be applied going downhill. Night and day. Also on the gasser we would get 8mpg, on the diesel we are getting 13. Stunning fuel mileage. Hope this helps.