Hmm, I have an idea: Maybe if a cargo truck (or more likely a couple of Trucks), repair PC and an M88 were all within a few metres they could repair, given time, anything cept a hole in the armour. So the cargo truck(s) carries the spare parts, the PC has the guys and, the M88 has the crane (sorted). Though it would still be a fair amount of time before the thing is anywhere near operational. Though Pop Smoke, I'm sure it takes less than 5 hours to swap an engine out. Its closer to 30mins for an AS90.