What a great tractor!

Yeah, those rear tires look like they'd be more at home on a truck but no doubt they'll work well.
I'm a fan of the air ride seat that's in my MX and I still need to install the air ride pedestal in the M6060 but will get to it this fall along with the upgraded alternator, rear wiper and rear defrost glass. Part of the delay is that the seat in the M is very comfortable as is, in part due to the improved ride of the bigger tractor over the smaller MX.
By the way, it looks like you have the older style cast iron couplers for the rear remotes, similar or the same to what's on my MX. The MX models have a newer (cheaper) style now it seems.