I've seen garage units done two ways... one is to build the whole thing on top of the frame, the other is do a step-down on the frame and build the floor of the garage after the rear wheels. The 2nd method is easier to load but it takes some engineering to make it strong enough to pull a trailer and you will get rear swing with the wheels so far forward. If you use the 2nd method you will need bulkhead / gusseting to give it lateral strength, or you will need to incorporate the rear ramp as part of the structure when closed.
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