General wiring code for AC is; 30 amp -- 10 gauge would be used for your power cord
20 amp -- 12 gauge
15 amp ---14 gauge
12 volt circuits depends on your current draw. Use LED lights, more efficient, more $$.
110 volt wall switches are OK but why not go to your local RV parts place and buy 12 volt switches. they are smaller and take up less space.
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Wireman
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