The problem with water systems is that many times the water pressure is all over the place. Many times people do not use pressure regulators if the system pressure is low. The problem is that this could change tomorrow and pressure be too high. Use a good pressure regulator not a flow restriction type as when you are not using water the pressure will rise to the level of the park system with a flow restricter. 45PSI should work well. The larger the park the more likely you could have high pressure. To have reasonable pressure at the end of the water system, they usually have to have higher pressure at the front of the system. So it depends where you are parked.
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