Pretty much non-specific answers to your initial post.
It depends on the year for sure.
Our 97 Intrigue has deep frame rails, with "some" huck bolts, at the front and rear suspension points only. The frame rails are noticeably narrow after that and the storage bays with associated structure seem to bear the weight and stress between the front and the back suspensions.
This could be described as a semi-monocoque frame?
Maybe a former CC employee could chime in?
I would love to see some pics of the rolling frames at the factory that were taken in the 90's.
'97 Country Coach Intrigue