What Did You Do For Your Travel Trailer Recently?

Question...I'm not sure I understand the need for this extra plug?...I mean, If i had a 30amp service I wouldn't have to worry about the heater and other things blowing breakers....and since I've only got a 20amp plug at my house, I often use a 1000 watt electric heater in the trailer with no problems as long as I remember to not use anything else electrical at the same time as the heater's on...so do you have two separate 15 or 20amp circuits for this or what am I not understanding here?