From past experience, I'm sure you realize that GM/Chevy reps read this web site and saying that you've beat on your car really isn't to smart, especially if you ever happen to take it in for service.The only issue i have with my car is the coolant smell....which is good considering i beat on it quite a bit, have drag raced it, tow regularly a bit over its capacity, have dyno'd it a couple times, etc.
Brakes look new after 14K miles even with the towing. Tire wear is a little faster than i thought but that's my fault not the car's. So far it looks like it's going to be a reliable car for years to come unless i get crazy with the tuning, but again, not the car's fault.
If the coolant smell (which seems better lately) is the only issue i have over the life of the car i'll be very happy.
And believe me, they have their ways of finding out.