found this and posted it once before, still for sale
http://www.esi-sales.com/f-1607.html
http://www.esi-sales.com/f-1607.html
That's a modified WW2 M4 High speed Tractor.
those are famous last words this is comming from some one who ahs worked on many pieces of rebuilt military armor those tracks can be good today and after a few trips down the road start comming apart i wouldn't trust any thing ther than a new track i have a friend has a m548 he uses for mine access 10 miles off the road took 2 years to wear out the tracks until they were beyond rebuild .and only 10 hours........my guess is track and rollers have a few years left in them!