Jeff,
Yes, that is the same park that I was at.
Since I am not sure were the cause of the problem is, I have not tried to correct the issue especially since I have only seen it at one park in 15 years as a fulltime RVer. A very interesting note is that I was traveling with 2 other Beaver owners at that time, a 2004 Thunder and a 2005 Monterey, and neither one of them had any trouble with the GFCI breakers. In fact one of them used the spot where I was tripping the GFCI without trouble and I took their dry camping spot.
Gerald