I have a Jeep Commander with 4.7 v8. The rated tow capacity is 6500 lbs. I tow a V-lite 26WRB with it. I use an Equil-I-Zer hitch and a Hayes brake controller. The trailer weighs 5400 lb empty, and I probably have 700 lbs of stuff in it. It took me several trip but I finally got my sway under control. The Jeep pulls with now problem, with a 5.7 you will have no power problems. I have had no problems with braking. I hate the brake controller I have and will be replacing it with a Prodigy proportional controller. If you don't get the tongue weight high enough and your hitch adjusted correctly you will go gray really fast. I live in Indiana and have towed my trailer to Wyoming, Montana, and Florida a couple of times. It has done well in the mountains but you need to be on your toes. Trucks did bother me quite a bit, but now I get just a little sway when they pass. The proper set up makes all the difference in the world. Good luck.
2008 Chevy Silverado 2500 Duramax Crewcab
Jeep Commander - sold
Flagstaff V-Lite WRB26