DW and I have looked at having a 12V auto radio installed in one of the top cabinets and then either use a soundbar or speakers installed in the space behind the TV. Problem is where to put the antennae - everything we looked at requires such so will need to get one installed. Have not been able to look around for a suitable 'RV' type antennae as yet.
You can buy car stereo antennas at Wal*Mart, Best Buy, any auto parts store or car audio store.
Problem is you'll have to run the wire and then drill a hole in your trailer somewhere to mount one.
Our Prowler came with a Fusion AM/FM/CD/DVD unit that looks like a car stereo and it was connected to the TV antenna on the roof through a splitter behind the stereo unit and inside the entertainment cabinet under the livingroom TV.
However, we were having problems with the cable TV coming in at RV parks, and after months of trying to figure out what was going on, I unplugged that coax connection from the back of the radio unit . . . and suddenly the cable picture was perfect!
Our dealership supposedly fixed it, but when we went out on our next campout . . . no cable TV.
I knew what to do, except that when the dealership reinstalled the stereo I couldn't remove it from the cabinet as they screwed it in so tight that I couldn't get the stereo out.
The dealership sent a mobile tech out to our house to fix that (plus a few other things they didn't do right), and he basically destroyed the stereo trying to get it out, plus the cabinet was torn up as well.
Anyway, they replaced the unit with a new model and he mounted it so that it could be removed easily, but used the same radio coax connector, and our last campout last month . . . no cable TV.
So I pulled the stereo and unplugged that coax connector . . . and now a perfect cable signal!
I am now waiting for a new connector to arrive from them, plus I am trying to locate one of those simple 'T' shaped diapole antennas and am thinking about going that route instead due to the fact that when the radio is connected to the roof antenna you have to have the antenna amplifier on, so if I am outside I can't listen to the radio while someone is inside watching the TV.
Anyway . . . sorry for the long story.