Can they not provide photos for you to look at? Do you have an ad that you can show us?
Where is the tractor located? (maybe a member here might be able to help)
A whole bunch of tractor scams start with the tractor being bought is too far away to view before wiring money (or sending money)... I would really worry that it's a scam if they say that "they" will ship it to you. BIG RED FLAG!!!