Good info, Thanks. I`m in western Oregon not exactly a Mecca for garden tractors. I see the variety and prices of machines from the eastern half and....One of the easy things to check for L to R steering is to get under the tractor and see if the steering gear is in place when the front wheels are straight ahead. The Sector gear has an arrow and with the steering straight ahead that arrow should point directly to the gear at the bottom of the steering column. If not you should drop the sector gear, and point it directly at that gear at the bottom. At that point you should roll the steering link between the sector gear and the front right wheel until the wheels are straight ahead, again. Once you have done that, check again for L to R. Then check for your toe-in.
Where do you live?