At one time or other in my life I have taken my horses over everything those mules went over. We used to take 2 or 3 ten day hunting trips up into Oregon, Idaho and Wyoming's high country. You have to go where the big deer and big elk go. Although, on the really big dropoffs, we would dismount and allow the horse to go down by themselves and then mount up again.
Dang (edit to fix language) I hate Kentucky...