Some state parks are just day use facilities with no campsites at all for either RVs or tents. On a Rand-McNally map those parks with campsites will show the tent icon. The day use facilities will not have the icon.

Attached is a screenshot of NW Connecticut. I camped last week at Housatonic Meadows SP that shows the tent icon. Nearby Kent Falls and Mohawk Mt SPs do not have camping facilities thus the tent icon is missing...