In reply to Dave Williams:
I worked for IH at Pumlumon in the 90's when we just had the one 'BogTrotter'. It never failed me on any runs but it was more of the fact that it was a handful and as a consequence one used to drive it with respect.
The local garage mechanic did see a lot of it though to be fair. As my off road tutor informed me...
"The suspension is all in the seat" and " Don't put your thumbs on the inside of the steering wheel".......meaning when you hit a bump your head hit the cab roof and if the wheels suddenly aligned themselves with a rut, those tractor wheels would spin the steering and anything dangling inside.
Taking a corner at 30mph was scary on a forest road, and parking it was an art and a work out as well, but the beast was fully MOT'd and made a spectacular if not menacing site in the rear view mirrors of tourists.