I pulled the weights right off Chevrolet's online "trailering specs" for the model I have, i.e., 2011 2500HD 6.6L Duramax w/Allison/Exhaust Brake, 4WD, Crew Cab, Regular Bed. I agree that the tires are probably the weakest link, and I may upgrade them to "Gs" to be on the safe side (I think the...