I’ve not removed mine but it’s on a swing out mount so it shouldn’t be a problem to remove. I’m surprised yours isn’t on the same kind of mount. There’s a small strap hanging down behind the TV. You pull that to unlock the swing mount.
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2017 Winnebago Adventurer 37F
2024 Lincoln Nautilus Hybrid Toad
Looking at the 2012 Journey brochure, it shows an exterior entertainment system similar to the one on my ‘11 Adventurer 37F. Mine had a 32” Jensen stuffed into the opening that couldn’t swing out even if it was on a swing mount. Mine was mounted to a flat steel plate held on by 4 screws (2 on each side) which were accessible along the side. First I removed radio and then the speaker and radio board by removing the 4 screws holding it in. The plate that the tv is mounted to rests on a couple metal L tabs welded on the back wall framing , so it will stay in place after the 4 screws are removed. Mine took a little persuading with a pry bar to free it. The rear of my Jensen had an array of composite RCA type connections that are not found on newer TVs. Mine had a feed from the Jensen stereo/cd/dvd player next to it along with a feed from the multiplexer over the cab area feeding the Sat/DVD/aux. to it. Hope this helps.