Not to many guys would take their trucks out like that and actually use them, most guys would burst in to flames![]()
lol I've made that same statement before, but ya know it's to each their own. If I had another one just like this one I'd probably restore it to showroom quality over time, but I've already got a grocery getter so guess what...ol' Blue's not retiring anytime soon
He has carried 4,000lb campers, and now pulls a 6,000lb travel trailer, and you are right, it's no joke, especially pulling them home up the mountain where I live at 5,200' elevation on really steep sharp winding roads. I always pray going up them hills! 
Factory C6 tranny (with a fluid cooler) and I switched to a HD Dana70 diff a couple years ago for weight carrying capacity along with in-cab adjustable air shocks and overload springs (took the overloads off though after the camper came off) Original factory drivelines. The trailer is an easy pull really, but then my truck is, I believe, actually rated to pull many more pounds than that. I still haven't found that actual numbers though.