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In MN you would need to have a disconnect on the building. They will allow something as simple as a regular light switch for the disconnect provided it is rated for what you are feeding it with. If your sub does not have a mail breaker, you should consider a disconnect ahead of it. Thinking now... thats permanent wiring. Perhaps "pulling the plug" would suffice.
Second... I am sure GFI's are required in that out building. Some don't like them when refrigeration is involved, but newer GFI's are a lot more stable that early ones.
If I were doing this job, I would bond the neutral and ground in the sub panel for your outlet circuits. A 30 amp cord is only 3 wire anyway... I see no need for a ground rod any more than you would drive one every time you parked your RV.
Good luck!
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2004 Montana 3295RK 2019 Ram / Cummins 2500 Summer season weekend warrior
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