We just bought a 2003 Chevy Avalanche 2500 8.1L - Do not now the gear ratio.. Standard Towing -10200 lbs Standard Payload -2146 lbs Standard GVWR - 8600 lbs Cargo is 2 adults(350lb, 2 dogs(130lb...
We now have a 2012 Avalanche. V8 4x4 5.3. We our 27QBSS 30' TT, 4102 dry weight with no problem. We have a weight distribution with anti sway. We occasionally pull our 16' princecraft behind the TT and don't feel it there.
Enjoy your Avalanche and TT. We feel GM has made a huge mistake in the decision not to make them anymore. We are however very biased.