I would run copper but it is very expensive right now. I think prices will come down. Aluminum will work. I ran standard wire to my camper over a hundred yards not under ground without conduit over 20 years ago. Just be careful to not get any rocks near it. A crosstie plant near us never uses underground wire with all the extreme use it gets with tractor trailers and big fork trucks that can carry a tractor trailer.
Lynwood
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