Supply Crates - Change the Models to be indicative of supply class

Make each class (A, B, and C) have a different model that shows what the content is, are able to be loaded ViV into a Humvee and are light enough to be carried and moved.

Maybe add heavy/light versions to distinguish between the ones we have now and these proposed ones, so we can keep the large resupplies that we can't move and still have an option to have smaller ones we can move.