My assumption is you will park in the truck section. If that is correct, all Js are about the same. Pulling in around midnight may be a problem. It depends on how full they are. There may be no way to get a "pull through" place to park. On the other side, the few RV sites will already be taken by those who pull in around 3 PM and stake their claim for the evening.
2005 Newmar KSDP 3910 + GMC ENVOY XUV 37K lbs Moving Down The Road
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