IIRC, VINs are not just non-sequential, they're randomized. Based on the YTD sales that JPD posted in another thread, combined with the May 1 inventory number, it's probably safe to say that MAP has built somewhere in the ballpark of 35K to 40K Rangers in just over three months of production. That's not really indicative of MAP's capacity, though, as they're only running one shift, and it has been a show ramp up because of it being an all-new vehicle for them.
IIRC, MAP can produce around 200K-250K units per year at full tilt.