Duramax Lifetime Supporter
Join Date: Jul 2009
Location: Austin - Texas
I am sorry to hear you are having problems like this with your new truck. I agree with smokinlmm – find a different dealership. Obvious but, did you check for a broken or blown rear shock - broken shackle?
My 08 dually is the best truck I have ever owned and has had none of the issues you have, towing, loaded, or empty. My top helper springs do not move with only 500lbs. I have recently downsized to a "bumper pull" horse trailer that weighs in at around 8000 when it is loaded up and I barely know it is back there. I don’t have a tongue weight but it is heavy - it levels the truck.
You may have a bad OEM tire but did you check your tire pressures? You really need to back off on your tire pressures with a dually when your empty or they will cup, as well as loosen your fillings.
It would help if you filled out your signature. Perhaps someone here that is in your area can recommend a dealership with a competent service department.
2008 GMC 3500 4X4
Crew Cab Long Bed DRW - Mostly Stock
AMSOIL Everything (except Antifreeze)
Reese "Tow Beast" Class V Receiver
Rhino Bed Liner (Not recommended)
AMSOIL Remote Bypass with Precharger and FilterMag
Mag-Hytec Differential Cover and Deep Transmission Pan
15.1 Calculated Average MPG (empty)
SS Brake Lines
Rancho RS9000XL Shocks
Heated Washer Fluid by Alpha Therm