Ok, finally found some quality time with the motor home and worked a bit on my dash. I discovered that a big source of squeaks for me was coming from the instrument cluster panel. The sides of it were rubbing against the dash holding it. Someone prior to me had that cluster off as it was missing two nuts that screwed unto some posts at either end.
I stuck on a bunch of thin felt pads so that the instrument cluster trim piece could not flex and rub against the dash. It worked very well - now I hear all kinds of smaller squeaks elsewhere around the front end.
Thought I would pass my findings along.