3Ts
Elite Member
I've towed a ~10,000# bumper pull camping trailer with a GMC 2500 and an 8.1 engine and allison transmission at 11,000 feet elevation and steeper grades than I was expecting. No turbo-charger. It got the job done, safely. I did have a concern at times if it was going to make it over the next ridge, but as long as I wasn't in a hurry we always made it. I'd be more concerned about braking than making it up the hill.