I have had 5 trailers and 5th wheels that were 30 amp. My wife was tripping the breaker all the time. My current trailer is 50 amp. It is great. Calling it a 50 amp is somewhat of a misnomer in that it is really 100 amps. It is not a problem if 50 amps is not available, you simply put a 50 to 30 adapter on the plug. I also have an adapter that I can put on it if 50 is not available, but if two 30's are available then I can get 60 amps. Or if there is only a 30 or a 20 available then I can plug into both and get 50 amps.