One thing to remember is that if you are in an established campground, there are usually limited generator hours, so you can't run your generator all day. Often the hours are something like 7-9 a.m., 6-8 p.m. I don't think I've ever been in a campground that allowed generators at night.Air conditioner, lights,laptop(TV) fan.
Lights and fan can be run from your battery, using the generator to recharge that during allowed hours. laptop depends (we only use ours if we have Shore Power)
Full disclosure: we've stayed with solar panels, they work well the vast majority of the places we camp these days. I could not handle a generator on solo trips, we don't want to have to tote the fuel for it, and both dislike the sound of them. If we ever decide to head to darker, more rainy climates, we might get a good, quiet one as a back-up, but will likely head for sites with power. That's what we do now if it's going to be very hot or cold on a trip.