I left last Sunday am and got home Saturday at 10pm. Did 3,952 miles with no problems. The jake brake was the best thing I took with me. The sign that said 10% grade next 3 miles was the scariest thing I saw. (Pennsylvania and West Virginia) I just slowed to a good speed at the top and flipped the switch for the brake to activate. Piece of cake, didn't even make wifey nervous. Need to take one more about a 5 hour ride but that should be nothing. Guys if you tow or pull in the mountanis the exhaust brake of some kind is a neccesity instead of a luxury.