Swampsauce,
Not sure exactly what you think may be the problem. Almost all parks that supply power have both 30Amp, 3-prong outlets to match the power cord of your t/t or motorhome, and a standard 20Amp outlet that you could plug regular appliances or extension cords into. A lesser number will have both of those PLUS a 4-prong, 50Amp outlet for those rigs wired for 50 Amp service. They are, with few exceptions, all 110/120 volts, the difference being that the 50Amp rigs use one leg of a 240 Volt feed to power half of the breaker box and the second leg to power the other half. If you're saying that they only have a 20Amp outlet (like you'd find in your home), you'd be limited to that amount of power for all your lights and appliances. In most cases, you wouldn't be able to run an air conditioner, or a coffee maker and microwave oven at the same time either.
