We bought our Holiday Rambler (AKA Monaco Diplomat) new and would definitely buy another in that same time era. Never any major problems and love the 4 slides with the N/S bed floor plan.
The Cayman has the 4 bag chassis, which is not the best riding of the Roadmaster chassis but is not that harsh. I do not remember if they had corrected the trailing arm problem by then, but I don't think they had, so make sure the trailing arms are the new style or plan on spending $5K on the first day, for the upgrade. That is a major major safety factor and I personally would not drive away from where it is parked, if the old style trailing arms are on the coach.
Here is a link to the
brochure for the 2006 Monaco Cayman .