I was pulling a 25' Salem with my 5.3 Yukon. Guessing it weighed about 5000 lbs. never a problem. (didn’t even have the brake controller hooked up, unknowingly) did work manually however but it stopped pretty good. And I am a cautious driver. The Pilot part of me makes me plan a few turns ahead of myself. Not many hills around here though. Traded and got a new 1500, life was good, still with the 5.3. Mama says she wants a new camper 500' long, ok really 35 feet long, I talk her down to 32' long, sticker after sticker says 9-10 thousand lbs....I give up the 6 month old 1500 crew cab z71 for a diesel crew cab 4x4 and man what a ride when towing. BUT that is all I use it for though. The ride is quite rough and it takes a Wal-Mart parking lot to turn it around.
run what ya got just be safe and stay in a zone where you can get in trouble.