For me, it would need to be nearly a barn size.
Make it large enough to accommodate a full 40'+ long RV or 5th wheel.
Of course, the 20-30-50 amp station would be good.
My biggest concern, in Minnesota, is keeping water & plumbing system from freezing.
You could easily build a separate toilet/bath room in the building, that would be convenient any time, even without the camper in there.
But realize this, no matter how big you build it, one day you may wish it was bigger!
Now where can I store these scooters and golf cart...…...LOL
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Rusty
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