Obvious there are major electrical supply issues with that park. Could be the park's electrical system is poor engineered, or it could be they cannot adequate supply from their electrical company. Either way, I wouldn't be staying there. Way too much chance there will be low voltage issues that will cause damage to some electrical components in your rv. Especially the A/C system. Heaters, no really a problem with damage, but low voltage will increase the amperage draw on the circuit, so you will probably start tripping breakers.
Curious as to how their pricing compares to other parks in the area. Are they a whole bunch cheaper, which would at least be semi-fair or are they just trying to soak the suckers.