I towed a 2800 lb jeep on an 1800 lb double axle steel bed trailer 325 miles one way with my M1009. I have stock 31" tires, stock axles, no turbo, a Class III hitch that was bead welded and bolted to the truck frame, and a Tekonsha trailer brake controller. The truck ran fine at 60-65, but I kept it between 55-60 to save a little fuel. It slowed down a little when riding up the overpasses, but it did fine altogether. I got around 10-12 MPG for the ride up with the load. My M1009 is one of my daily drivers so I keep it in excellent condition.