Duramax Third Generation: 2006-2007.5 (LBZ & LLY)
Howdy. 2007 Classic 3500 DRW, 108,000 miles. On my first RV trip with the truck in many years. First time going up to Oklahoma then west through NM, Arizona and Utah. Pulling a 38’ fifth wheel with GCW of about 22,000. In the 99-100 degree weather we have been having, I have concerns about...