If you do not own the land or do not have a lease they can evict you with proper notice, and it appears they are evicting you legally, every thing else you stated is totally irrelevant.
Land is not divided like that. One share is not one part and another share another part.
Unless you have a lease, yes, this is legal. They have to give you 30 days to move with the trailer. If you go past that they will evict you, if you abandon the trailer on the land or not.
Since the trailer is not really yours you can't move it, so you will have to move without it. "taking over payments" does NOT mean you own it.