i have a 2004 Gmc cc sb duramax LB 7 rancho 4in lift 315 75 16 tires edge juice with attidude, 4 in exhaust, S&B intake. i use for the farm and to tow the 30ft Terry quantum travel trailer. Also a i am working a 2004 2500HD Chassis with a LLY for my 72 burb body to sit on.