Rules vary widely, but here, for a CO (certificate of occupancy) sewer (septic in this case), water (well here), access, and grid tied power would all need complete prior to CO. I have no idea how things in Mich work.
One work around here; you get an irrigation well permitted (for your agricultural operation, wink wink), with a power pole, and a 20amp receptacle permitted; 40 amp 240v for well, 2 20amp,120v receptacles; but you pull wire for 200 amp. Once everything is closed out, boom, you wire as you please. Then you can add your camper, camp, whatever, and your diy, unpermitted septic, ect.
Not saying good, bad, or should vs shouldnt; just how people do it.