Same thing happened on mine a couple of years ago. First night at the campsite at 1 am. Trip canceled! Couldn't figure out what was burning since the fan blew the smell all around the rv. When home I removed A/C cover and found the problem. $30 buck fix. Burnt smell took forever to go away.
We have a trip planned to the same site next week. Went out today and the A/C breaker was tripped. Flipped it back on and come to find out the blower motor makes a loud screaming sound when starting. Turned breaker off and then back on and the blower motor hums but doesn't turn. Killed the power again and took off A/C inside cover. Found it's really hard to turn blower motor. Ordered new motor. Waiting on UPS Tuesday to leave after I install it!!!
I hope that's the fix.
I think future trips to this campground will have to be avoided. My A/C doesn't want to go there!!!