Well, never saw that one coming! But IMO, the opening of the bottom hatch would simply allow the sand to flow into the vehicle bay, the extra shovels were supposed to be used to break up any ground cover remaining over head, after the top hatch was opened.
Not having the Riverton module handy, but doesn't the bolt hole description mention a light dry sand being used?
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The reason that the American Army does so well in wartime, is that war is chaos, and the American Army practices chaos on a daily basis.
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