I have 75,000 miles on my 1997 3/4 ton Ram. I tow from time to time, but never more than 6,000 lbs. What mileage should I expect to have to change the clutch? (I realize this is subjective, but I am basing my driving habits on other manual transmission cars I own and the life of their clutches with me driving) In addition, is the whole hydrualic clutch actuation system, made by AP I believe, replaced at the same time? (I don't see any place to bleed the system at)