I towed for years with a Ford V-10, I now tow with a diesel with an exhaust brake. The new diesel exhaust brake is much, much better than the V-10. Salt River canyon on highway 60 in Arizona is several miles of 6 to 7 percent down grade, then the reverse going back up. I have traveled this many time with the V-10, then with the new 6.7 Power stroke. I can drive this touching the brakes only three time on the decent keeping my speed under 35 with the Power stroke. I used the brakes many more times with the V-10.