No 110/plug in for pop up

I was plugged in to house power, prepping pop up for weekend. I had a portable air conditioning unit plugged in and it was working fine. Then was the time to test batteries. Yes I have an inverter, and two batteries up front. As soon as I unplugged from shore power the whole rig lost power. I waited a bit, the camper has dome lights, and power to the radio inside, so its getting power, but no ability to plug in anything. NO circuit breakers blew, no fuses lit up.
So I plugged camper back in, and same result.
Anyone have any ideas? I've pretty much given up on the AC unit, assuming its pulling to much from the camper; I don't know.
But how do I get the 110 back?
Thanks.