It's nothing new. The radio in our 2008 Rockwood was basically useless when anywhere out-of-town and the one in our newer 2018 2608SB is just as bad for reception ... and yes .... they mounted it high up on the wall where the screen cannot be seen unless standing on a stool. The overall electronics supplied with these trailers are essentially JUNK.
This, by the way, is simply comparing no reception in the trailer with great reception in the truck 10 feet away!!!!
Bottom line. Replace everything including radio (receiver), speakers, TV with quality components OR go camping!!!! While it annoys me no end ... I really don't NEED these things when out camping. Just like I really, really don't NEED to have a cell phone clamped on my ear all the time!
Relax. Enjoy the countryside. Go for a walk. Light a camp fire. That's what it's about for me.
2012 Dodge Ram 1500
2018 Rockwood Ultra Light 2608SB