Yes I have the HO, rear air LongHorn, AISIN, DRW and 4.10's. I tow 50% of my mileage and just completed a 8k trip from NW WA to SoCal and to DFW TX and back same route towing 35,500# combined. Truck 10k, RV 24k and MC trailer with full dress HD behind 1,500#. I averaged 9.2 mpg with a low of...