I'm struggling to picture why you'd ever need a second machine to help put a track back on.... because you can lift the entire mini-ex off the ground all by itself just by using the front blade and the bucket/arm on the other side. At the very least you can have the bucket/arm/boom off to one side and easily lift an entire track well off the ground. I had to help do this once on a rental Bobcat E35. I threw the track off by grinding turns over bumpy ground with lots of sticks and tree branches laying everywhere, machine had 2200 hours or so. We didn't need a second machine at all - BUT, a second person was very handy to use the big prybar to wedge the track back on as the other person drove that side's motor back and forth a bit (in the air still).
As I awaited the rental yard's repair guy, I spoke with the owner a bit. He said for his fleet of rental E35s, once they get ~2500 hours on them, he sells them for about $25,000, usually in quite decent shape. They definitely fix issues promptly and always grease religiously after every rental, BUT! people do beat the crap out of them too. I know for myself, I occasionally used the machine rotation to whack the boom sideways into saplings, bending them over enough that I could use the hydraulic thumb to then get a solid grab, and quickly rip the tree right out of the ground, no digging required. Worked for trees up to about 4-5" diameter. Probably awful on the machine though (I stopped doing it after some further contemplation). Some people rent them to demo houses and sheds/garages, etc. Very rough work.