My 99' Ram 3500 5 Speed started slipping pretty badly.and I'm suspecting what I use truck for to be the culprit. My truck has a dump bed and I haul gravel,dirt,mulch in it. I also pull a trailer and buy junk cars and trucks. My question is what type of clutch should I replace the worn out stock clutch with. I carry over 4.5 tons of rock in somewhat hilly country,south central Indiana. Helps please.