Mark, I advise you to inquire with a licensed electrician in your area as RV power pedestals often have required codes that need to be followed and may also need to be permitted.
That said, the average RV uses a 120 volt, 30 amp, 3-prong (1-120v hot, 1-neutral, 1-ground) power supply. Although they can look like a 240 volt, they are not, and a 240 volt supply (2-120v hot wires, 1-ground) should not be installed as it will damage your RV and all of your electrical devices!
I would want the 120v, 30 amp supply installed. It provides the ability to draw more power when needed or desired, say to run the air conditioner in the summer, an electric heater in the winter, or a hair dryer and the coffee pot at the same time.
The 30 amp would be more expensive initially because of the more robust wire and components, but you only pay for the power you draw, or use, regardless of what the components can handle.
I hope this helps. Good luck.
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2005 22' BT Cruiser 5211, Chevrolet 3500 chassis w/6.0L Vortec V-8; 6'x12' Cargo Trailer; Honda CB500X motorcycle for street and ADV riding; Yamaha TW200 motorcycle for dual-sport and trail riding...All of it for fun and adventure!
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