Well, I managed to tow a 5 pack of 4wheelers up to fairplay from denver this weekend with my supercharged auto. the trailer weighs in at roughly 4800 lbs. loaded with the quads

I made it up crow hill at a cool 45mph with my foot to the floor and supercharger whining like a son of a beach. But, i made it up and back with no problems. I did take the truck to get its tranny flushed and oil changed this morning just to be on the safe side. The down side to towing it? 8.6mpg there and 11.5mpg back. YIKES!