Since I started this thread, I thought I would chime in. I have spoken with the factory several times and with a gentleman named Dave, (can't find his card to get the last name). Dave has been extremely helpful and answered all my questions. These things (Mattracks) are just not right for my application. I have no doubt they would work, but I need a completely different piece of equipment to do what I need to do.
If anyone thinks that this may be what you need, give the factory a call. They get trade in units all the time. They just re-bearing them and are pretty much good to go at a substantial cost savings. If they would work for my application, I would definitely own a set!!!!!!
Jim