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Hopefully you're using one of the adjustable regulators, not one of the fixed pressure ones. A regulator cannot increase pressure, only reduce it.
Since you say this happens in every park you go to, it's unlikely but there is a possibility that the utility pressure is low. The gauge on the pressure regulator indicates the regulated pressure, not the incoming pressure. By the way, 60 psi is a good healthy pressure and should not damage any piping in your home or your RV. Is your inlet screen clean as well as the other usual suspects?
I've started the practice of installing a wye water hose fitting on my water connection whenever I camp and use one side for my RV water supply and attach a pressure gauge on the other to gauge the utility pressure. This also gives me the flexibility to connect the tank rinse without interrupting the RV water supply.
Utility pressure will fluctuate a bit over the course of the day depending on demand.
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