I decided to do a comparison video of the Oliver cletrac oc3 vs the ford 9n because they are both light 4 cylinder tractors ones just rubber tire  and one has tracks 
Moved a lot of wood with both, preferred the 9n on dry bare ground, always wanted a set of tracks for it. The oc3s were viable rigs for cheap but the JD MCs and 40s were more sure footed.
I suspect the drawbar on the crawler is what hung up when it spun down. It looks like it cuts your ground clearance by 4 or 5 inches, which can make a good bit of difference in whether or not you get stuck. I noticed it had no trouble backing out of the hole it almost got stuck in, going forward. As long as it has the power to pull through deep mud, the crawler should go much better, in mud, than the rubber tired 9N, except maybe for the ground clearance difference.
It may be near my age or more even as I'm seventy four. I am impressed that its so agile as the cletrac I am familiar with was called the "Forty" and it took near forty acres to turn it around... course it was the bull dozer type machine. I remember it having as much heart as a big dog Cat dozer in the D4 size back then.
