I tow a grand design 348 M that has specs of Dry Weight 13,400 lbs., GVWR 16,500 lbs., Hitch Weight 3,100 lbs. I have a 2012 GMC Sierra 2WD Crew Cab Duramax LML with 130K that has the exhaust and EGR deleted, and an H&S Performance Mini Maxx Tune. when i did the delete I changed out the...