My husband took out the old, heavy TV from our 2003 Minnie. We already had the entertainment center instead of an upper bed.
We searched Habitat for Humanity stores for a matching door. My dh hinged it at the top. We hang the flat screen TV on the door front.
We have a HUGE storage cupboard behind the door. He did insulate and covered the sides with paneling. He ran electricity into the front of the cupboard to plug in the TV. We have a power surge strip on it.
If you want more information he'll have to answer the questions. :-)
Mike Leslie