A generator isn't required if you don't require a generator :B
We enjoy drycamping and don't always take our generator with us. For winter camping we take the generator, to keep the battery charged when we park for a couple of days, and on occasion we've used the generator for the truck's block heater on cold mornings (way below freezing).
Most campgrounds in the north have 15A, some have 30A and fewer have 50A.
Air conditioning usually isn't needed because it usually cools down at night.
In summer there's plenty of daylight so interior lights don't get a lot of use.