my 90 has just been dropped of at the garage with the clutch slipping and smelling, it has had 2 clutches in 2000 miles and the garage said it is drivers error, it is used to tow a horse box and get me around the woods on hard tracks going off tracks sometimes, it has got stuck a couple of times but always pulls its self out( i have been stuck in worse places in previouse landrovers). any ideas why it keeps burning out clutches/