I have a 2006 V6 and a 2008 V8. Towing two quads (1800 lbs), Single axle trailer (800 lbs) with sprung 3500 lb Standon axle, not torsion bar, additional items on trailer being spare gas cans, chains, jack all (hi lift jack), spare tires etc. with average total weight of towed unit being 3300...