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The M820A2 is the lift gate model of expansible van trucks, and it is based on the M809 series 5 tons. The "A2" is the lift gate designator.
https://www.steelsoldiers.com/threads/m820a2-is-home-safe-now-its-time-to-check-her-out.30647/
I will be able to get more accurate M109 dimensions soon...