Did we break our Avalanche? Do I need to get a 2500?

agesilaus wrote:
There should be a label on the driver's door post showing towing capacities.

The label on the drivers door jam is going to tell you about three things: The axle weight ratings (front, rear), the payload capacity and what your tire size and pressure is supposed to be. It doesn't list towing capacity.

The owners manual should have it. Is it a 2 wheel drive or 4 wheel drive? If it's 4 wheel drive, for being a 2007 you most likely have a 3.73 axle and a 7200# towing capacity.