Seems like they could get most of the benefit at much less cost and complexity by going with side-by-side "dualies" If one of the tires goes flat, then there's

Seems like they could get most of the benefit at much less cost and complexity by going with side-by-side "dualies" If one of the tires goes flat, then there's built-in redundancy from the other ones and it could be replaced in the field if needed, but no one's going to be able to overhaul this track mechanism without a shop.