Dennis,
I just returned from my inaugural 4000 mile trip. We have a 2005 3500RL and the TV is a 2005 HD2500 4WD SB. It was fabulous. The 5ver pulled fantastically. Bottom line is that we enjoyed the RV more than any home we have owned.
I have made some modifications to the truck and 3500 RL. I had Firestone self leveling airbags installed. Although you may not need them, I find that it does keep both the TV and 3500RL level. I also installed a MOR/RYDE pin box on the 5ver. I firmly believe if I had not, that Cindy ould still be bouncing a week after the trip
.
Probably the most impact for the dollars was the purchase of the Pullrite Superglide hitch. Unfortunately another RVer attempted to make the same sharp turn I did and did not engage their manual manuvering handle on their hitch. As a result, they punched out their rear window on a new Duramax SB.
Good luck and if you have any questions you are more than welcome to contact me. Just PM and I'll provide a telephone number if you want to converse directly or email.