Batteries

iradi8 wrote:
They came out and checked it out at the post and it was fine.

Of course they did.
That doesn't necessarily mean that it IS fine.

I find a small analog meter(one with a needle and not a digital readout) to be well worth the $12 or so price tag.

It will show power fluctuations that digital meters will miss because of damping and slow reaction times.

I think you should:
Ask around of other nearby renters to see if anyone has a portable AC meter.
Ask the park to come test the power again......and more thoroughly.

This REALLY sounds like the camp has a BIG fault developing in their AC supply.