ive got an 09 sierra 1500 with the hd tow package, and ive got a 2015 hyperlite 27 hfs, tows it no problem. ive got air bags in the back with an on board compressor and a WD setup as well. truck sits level, doesnt bounce or sway, but ive also got the sway control bar which im sure has kicked in several times when a gust of wind has picked up and hit us side ways. trans temp stayed under 200 as well. i know my truck is rated to tow right about 9600 pounds, the toy hauler is something like 6400 pounds dry and empty.