I'm in the film business and my job is to govern these things (production designer).
Don't watch that show, so couldn't say for sure, but if it's a reoccurring set, the interior is most likely built of modular components. If you turn the camera around, you'll likely see a grip sitting on an apple box and the on set dresser perusing the craft service table. My trailers have been used on tv shows and commercials, my avion has almost paid for itself. It's been a somewhat reoccurring domicile for a character on a current AMC show, but they've shot it practically on the inside...
If anyone is approached to rent their trailer for a film shoot, you are welcome to pm me for guidence. It can be very lucrative but also a total disaster...
Fun to see these old trailers as character enhancements in film.