We've been pleased with both DuraMax-powered/Allison transmission vehicles we have owned.
The two trucks mentioned above, a 2006 Chevrolet 2500 HD and 2012 GMC 3500 HD have served us well. They have been dependable, powered adequately to pull our 5th-wheel trailers for the last 10 years safely, comfortably and efficiently. For the most part, both have required little other than routine maintenance.
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