With the small drive gear in the rear, and an equally small front idler, and "ramps" on each end of the track line because of this... It just looks like it was made to porpus, or rock from front to back. To short of track line for the length of the bed and any cargo with weight. Wants to rock back on it's trackline going up a steep hill empty, I think... Plus it is heavy.
My bet in the deep stuff it would struggle, especially carrying significant cargo. I would love to see an exploded view of the differential too..
Cool idea though.
Regards, Kirk