Thanks for all the replies.

First, yes it is a true multifunctional purpose of kids and deer hunting. I have been promising my 7 year old a tree house for a few years and I want to build a better stand so 2 in 1. He does come sit with me sometimes when I go hunting in the back yard so it would be both anyways! Right?

Second, solar is out as it is in a well forested area. I don't want to deal with a battery, the whole point is to make something permanent.

Third, I was planning on renting a trencher. I already know where the underground stuff is. I had geothermal put in two years ago. I am a bit rural so I don't have much. Definitely will use a GFCI outlet. I paced it off and got 163 paces. I figure about 2.5 feet per pace so that puts it at just over 400' which sounds about right. I figured 10 gauge would handle it but I just wanted to be certain I couldn't use a lower gauge. I will head over to the suggested forum.

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2009 ML320 Bluetec
1985 300CD
1981 300TD

Past Mercedes
1979 300TD
1982 300TD
2000 E320 4Matic Wagon
1998 E430
1984 300SD
1980 300SD