I have a tv hookup in BR. If I connect a cable to it and put up antenna, I get "over the air" reception. If the campground has cable at the post with water/electric and I connect a cable from my fiver...
If you are talking about connecting to your trailer's outside connector, maybe.
First make sure to switch off your antenna power at the wallplate near your TV. This switches from antenna to cable. If the cable feed is analog you can now do a channel scan on your TV. There may be a menu item on your TV to switch from antenna to cable.
If the cable feed is digital most likely the campground will make a set-top box available.