Don't know how I missed the last photo you posted but it is really awesome. At a look , I am guessinf that they did not have the tires mounted on the M7 in the storage position or they might have slipped them on before loading. Also, they couls have backed the M7 on under its own power because the underside is all sheeted in and it the front would have slid over the ground easily.
Very interesting pic, thanks fro posting it.
Sean