Every RV park I've been to so far, cable means the old analog cable channels that TVs have been equipped to receive since the 1980s "cable ready."
You bring your cable, connect it from their outlet to your connector, where ever it is (utility compartment, sidewall, or direct to TV if RV is not cable ready).
Turn off the booster for your antenna, that usually interferes with cable reception.
Your cable-ready TV has a menu with options for the tuner. There will be
"Antenna (or broadcast)" and one or more "Cable" options. Switch to one of the "Cable" options, there were several sets (bands) of cable channels, but most of the interesting stations are on the lower numbered channels, and those are the same for most cable bands. Then do a scan to let the TV find the active cable channels.