My camper is a 30 amp with a 15,000 btu air, we run the air 24x7. We did put in a dedicated 30 amp RV line. We never run the air conditioner and microwave at the same time, even in campgrounds, this is the only thing we have to watch when running the air conditioner. Everything else is OK with the air on.
If your camper comes with 50 amp, you can get a step (up) adapter, probably need a couple. A step-up from 20 to 30 plug and then a 30 to 50 amp plug. Then you can plug your camper into the 50 amp adapter plug.
You should be able to run the air conditioner with no problems. But once you reach your household 15 or 20 amp max amount (the breaker) will pop. That's the worst that will happen.
If (when) that happens, then you'll probably need to think about running a dedicated line for the camper with 50 amp service if you want full electric use of your camper.