Thanks for posting this video. That unusual track system seems to work well, though I have a small concern about lateral stability on slopes, as when traversing a slope. This video did not include any moments when both the "front" tracks and "rear" wheels were both on a lateral slope, but the relatively low center of mass would argue that it would be fine. The guards on the trunk-control wheels might be really helpful in thicker quarters, too. Good luck with it!
