Rally electric at this year's Region 3 rally in the fairgrounds at Elkmont (west of St Augustine) constituted for some of us sharing a 110v 15 or 20 amp circuit. So we could not use air conditioning nor microwave. Curling iron or hair dryer were iffy and improbable. Later in the rally the fairgrounds starting installing 30 amps for many of the "spaces" -- it was a really nice rally and we didn't mind the hookups just the way they were.
Rally electric at one of our Unit's rallies a year ago constituted five of us sharing a 110vac 15amp circuit. If anyone turned on an electric blanket (yeah, we finally figured out what was causing the problem) the breaker would trip and leave us all without power. It was pretty chilly and they wanted the warm bed . . .
Rally electric is plenty for the trailers' lighting and keeping the batteries charged. And that's all.
Acceptability of generators may vary. Deb and I think they should be only for last resort -- generator noise is a certain spoiler for some environments.