There is a very good YouTube video that explains in simple language the difference between 30 and 50 amp service. I refer back to it often:
Click here.I don't understand how it works, all I know is, the 50 amp service, the electric cord, and the trailer all work together to balance the 50 amps.
Manage your available electric Amperage usage, either 30 or 50 and let technology do what it is supposed to do, and just enjoy camping!
However, here's the formulaa used in the video.
120 volts X 30 amps = 3600 watts (I suppose that equal 2 electric 1500 watt space heaters, with 600 watts to spare).
120 volts X 50 amps = 6000 watts X 2 = 12000 watts (I suppose that equal 8 electric 1500 watt space heaters with zero watts to spare).
Good video. Watch it, it will help you understand.