Use to have a 2013 Tahoe (3:08 gears) pulling a 31.5' TT weighting 6,200 pounds dry. Pulled the weight okay on flat roads but did slow down to 45 mph going up the Grapevine. Biggest problem I had was sway, the TT wanted to wag the Tahoe making the drive a full white knuckle drive. I'm just glad the two long trips made using the Tahoe that there was no cross winds.
Moved up to a 2015 Ram 2500 4x4 Mega cab short bed diesel and what a difference. No wag, no slowing down and no more white knuckles. Plus went from 8 mpg to 14 mpg towing with the Ram.