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The last two photos are both M151s, not MBs or GPWs. Interesting that it does show them stacked, but on a rack and not resting on eachother like was claimed.
It does seem like it was more of a WWII era idea, but I was told by someone that the MUTT was designed so they could be stacked in a similar manner, which is allegedly why the front fenders and the rear arches are the same height.
I've never seen any evidence to support this practice, but...