These are really interesting.
Got anything on their specs? What hulls these are adapted from?
Afraid he doesn't look all that "all terrain" to me. It only has four wheels, and they seem quite poorly supported. There's no really apparent chassis for the wheels, it looks like a table on castors basically.
A tracked vehicle would have much better all-terrain capability and also stability.
From its armament (long, slender gun barrel and an autocannon roof mount), I'd say this should be your tank, frankly.