UPDATE: Price dropped to $4000
(07/01/2023) While it has three doors, according to the seller it does not appear to be a hyrail or Fairmont build. So, the history of it isn’t clear.
https://www.facebook.com/marketplace/item/960552245195371
“Very rare 1951 Willys wagon with the third door passenger side. It’s not a railroad. Or Fairmont built There are no holes in the floor for the towers.  so if you know anybody or any company who needs a Sema build that was my plans”