Welcome to the forum and the wonderful world of trailers, Unless you have a 30 amp 120 volt circuit (VERY UNLIKELY its a special plug ONLY used by RV's a 30 amp 240 volt DRYER outlet looks similar but is VERY DIFFERENT VOLTAGE) you are plugged into a 120v 15 or 20 amp circuit and using an adapter for your 30 amp cord. You don't have enough amps to properly run your AC. That's probably why it's acting weird, it just doesn't have enough power to operate properly and never will plugged into a 15 or 20 amp circuit.
