I can't complain about my Chevy 3500 Duramax diesel dually. I'm on my 2nd one now (first was purchased used and the body was falling apart, second one was purchased new). Before that, we bough a gas 3500 Chevy dually. No comparison between the gas and the diesel. I'll not go back to gas for towing.
I can't comment on the GMC version, never towed with one. But I do know my set-up is a really sweet ride for towing! After owning a dually, the stability, never a hint of trailer sway, and ... oh the power .... I'd never want to tow a trailer with SRW now. I'm just too spoiled now. And I sure do enjoy a comfortable ride, and driving uphill when towing a 35 foot trailer and STILL be able to pass passenger cars that are breathing through life-support just to make it to the top!
