[Chuck]

there was no cable tv back then, so no, there wouldn't be any factory connections for it.

In my trailer, which should be very similar to yours, there is a 12v outlet over the fridge, built into the bottom of the cabinet over the fridge. That outlet also contained an old-fashioned tv antenna outlet. I would guess that your trailer was probably wired for an antenna, whether it came with one or not. maybe not. but anyway...

I changed this outlet out with a modern 12v/cable tv outlet, ran the cable down behind the fridge, through the hardware cloth screen in the floor of the trailer (that forms the air intake for the fridge vent), and then attached the cable to the belly pan of the trailer, running it across to the street side. (since that is where most campground service pedestals are located.)attached it with sheet metal screws and cable-clips. It terminates near the front of the street side wheel well. I looped back about a foot, so I can easily reach under there and detach the cable from its last couple of clips, and about a foot or so of cable will stick out. from that I can attach another length of cable to a campground's cable connector.

cheap, quick, easy, completely out of site, and I didn't have to punch any holes in the skin of the trailer.

If you want to add an antenna in the future, its wire can be run to this same outlet. it has inputs for cable and an antenna. modern antennas will require a coaxial cable connection, but there are adapters for the old flat-wire that could be used on either end of it. to run a new piece of coaxial cable from the typical antenna location on the roof to this outlet location would require that you drop the ceiling panel...which is a pita. (but "do-able").