That sounded alarming to me as well, but looking at the photos I don't think it's actually sitting on its rims. It is probably supported by solid run-flat wheels, like the magnesium ones used on HMMWVs.

It's sitting on its belly wheels, normally used in these vehicles for trench crossing.

Are you sure? It doesn't look that way to me, particularly in this picture: http://ic.pics.livejournal.com/ntv/14201556/1204378/1204378_...