yep, loulou, no way your Avy has that high of a towing capacity.
only way would be the 3/4 ton with the 8.1 engine.
your 5.3 will be around 7500lbs. max. not sure where you're getting numbers of 10,000lbs. or 12,000lbs. but it ain't from the manufacturer.
in 2007, GM introduced the GM900 platform. the Tahoe, Avalanche and Suburban were the first to be built on that platform.
the Silverado and Sierra on the GM900 platform came later, towards the end of the '07 model year.
all since then, are built on the same platform.
my '07 Avy has the 5.3, the 4spd. trans and the 3.73 rear end that comes with the factory tow package.
its towing capacity is 7200lbs.
i tow a HTT with a UVW of 4470lbs. and weighs around 5000lbs. loaded for camping.
i live out West and would NOT tow anything that weighed over 5500lbs. loaded for camping. if i lived in Florida or Iowa, then maybe 6000lbs. but no more than that.
