The brace that you mention, to the right of the door, is thick steel, anchored through the wall and the trailer frame with big steel bolts and nuts. By contrast, the cabinets are very thin flimsy plywood, and they are attached to the wall and the floor with a few sheet metal screws into the aluminum sheet and the foam behind it. And we agree that sheet metal screws in thin aluminum pull out if you look at them crooked. I doubt that anyone is relying on that for bracing. Could be wrong, though.
At most, I would expect that if you remove the cabinets, you might consider retrofitting a 6" steel L-brace or two, similarly anchored into strong structures. They are pictured in the same thread.
Bill
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