Truck movement. Besides the "double white circles" it also has the "t" superscript in the MP column in the Vehicle Listings. The Type in the Listing is AC - not APC.
These use Truck movement as it says in the counter. An armo(u)red car using truck MPs is quite common, at least Germans, British and Russians have vehicles like this.
Note that, as it saw extensive use in the DTO, moving in open ground won't cost it too much - but beware of punctured tires when driving near to hammada...