1st time boondocking and could not get our AC to work

We had an issue in our brand new camper on the second trip out with it. First trip out it worked fine but we were on shore power for that trip. On the second trip it would stop working a lot like you describe when using the generator. We attempted to use only that one AC instead of both, but that didn't matter. Rear one worked fine. We ended up having the AC unit itself replaced and that fixed it. The generator was an on board 5500 Onan so it wasn't an issue of not having enough power.