I bought my Silverado HD 3500, 4X4, Duramax / Allison combo and i have owned a 1999 AM General Hummer and 2001 Ford F250 and this is by far the best investment i have ever made on a vehicle. I just towed a load of 14,000 lbs and it felt like nothing behind this truck. I was flying up 3% grade passing semi trucks at 85 MPH. This truck has the awesome exhaust brake for assitted braking power. This truck surprised me with its capabilities and i just wanted to post a message on how amazing this truck performs.