2009, 4x4, GMC Topkick, 93,000 miles, LMM Duramax, Allison automatic, Link air ride suspension, walk through to box, box has 2nd AC unit, aircraft seat track in floor and walls makes box modular, has bed, 335/80r20 tires and aluminum wheels, tires do not rub lock to lock, 5:13 axle gears, on...