It's not based on the Transit. One of the submitted designs was, but it didn't win the contract bid. Edit: looks like it was an early prototype from Oshkosh wi

It's not based on the Transit. One of the submitted designs was, but it didn't win the contract bid. Edit: looks like it was an early prototype from Oshkosh with very little in common with the final product: https://www.caranddriver.com/news/a19445176/this-ford-transit-usps-truck-prototype-could-be-hauling-your-mail-soon/ https://www.caranddriver.com/news/a19445176/this-ford-transi... and https://www.freep.com/story/money/cars/ford/2021/02/23/oshkosh-won-usps-bid-may-team-up-ford/4565972001/ https://www.freep.com/story/money/cars/ford/2021/02/23/oshko... mentions not using the Transit design.