daTeacha,
I'll try to answer some of your questions.
The tractors come into the USA in Georgia, Texas, and now at our place in California as well. They are in crates to maximize freight efficiency and minimize any freight damage. The final assembly varies a little per model, but basically the wheels/tires, seats, steering wheel, ROPS, three-point arms, some lights, batteries, etc., are installed here, plus the loader and backhoe if applicable.
Ag tires are available for the 15 series. We have some in stock, but most units in the west go out with R4 tires.
Yes, the reverse to first is a simple operation, but not quite as quick as a shuttle or HST in my opinion.
Branson is not made by TYM. Branson does build Cummin's A series engines.
Mahindra does not make tractors for anyone else, including Montana, but Mahindra does use TYM to build a few models that they market here as Mahindra. The model line from TYM has shrunk considerably as the Mitsubishi built 15 series has replaced all the under 35HP models. This is old data, but in 2004 I believe Mahindra consumed 70% of TYM's production worldwide. I suspect that isn't the case anymore, but I have no facts.