We have a 4500 and love it. I first towed a Montana 3670RL which we traded in and now tow a Landmark Monticello. The Monticello has a GVW of 18000 and I'm close to that. The truck pulls with no problem. We have the 8.1l gas engine and are getting an ave 7.2 mpg. It's been as low as 5.2 when pulling and as high as 11 mpg when not pulling. Tank by tank varies a lot depending on what you're doing. At the time I ordered it (2003) the only rear end I could get was a 5.13 so I slow down when going up the mountains.
I've got the Vershauler bed from Monroe and it works out well. If you have any other specific questions let me know.
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