Towing Update
I figured I would add an update to my original question about how these trucks tow that will hopefully help some of you.
This past weekend I had to help a family member move from Chattanooga, TN down to Tampa, FL. I hauled an empty 24 foot enclosed car trailer (28' bumper to hitch)( I used a WDH without sway control and it had electric brakes) from Tampa to TN, about 600 miles one way. I would guess the trailer was probably about 3500-4000 pounds empty. From a pulling standpoint, my truck did great. Pulling and stopping were no problem. I didn't even feel much drag from the large face of the trailer and was able to keep about 11-12 mpg and it is normally at around 18 around town. Control, how ever, was a slightly different story. I would't say it was horrible, but I was a little on edge for most of the trip. When I was riding alone and the road was fairly smooth, she did fine. When other vehicles came flying by it did tend to get a little squirrely.
In my opinion based on this little trip, I would say to probably not go over a 21 foot TT (usually around 24' bumper to hitch). I was very close to getting a 24' TT that was about 29' overall and 5k lbs empty. I am glad I didn't. Like a few people had said, The truck would have pulled it, but I would have been nervous driving the whole time and that may have affected how I felt about camping.
For the type of RV I want, I will either end up upgrading the truck or going the motorhome rout. I will say that I was very impressed with the power of the truck, but she just doesn't have a big enough stance to handle the leverage trailers that long can produce.