I've just had cheap bookshelves and desks made out of MDF that did not last past a couple of moves before falling apart or warping badly. That and it just looks cheap to me.
Thank you very much for all the feedback. I am not going to let the MDF looking cabinet doors stop me from considering the Northstar Arrow 8.5. It seems to have the features that would work for us.
-tip out tent bed in the cabover
-sturdy looking bunk bed
-option for aluminum siding instead of the filon/luan lamination
-cassette toilet
-fits on a short bed truck
Jason