Rvflyer, Here's the brochure
http://www.monacocoach.com/StaticFil...7/07Cayman.pdf
Yes, it's coming on the RR4R chassis with the problem trailing arms. I would say it's the worst problem on the coach.
So make sure the arms were changed before buying it or negotiate a $3k drop to repair. (Plus make a complete checkout of the coach at a knowledgeable RV repair shop).
Besides, it makes an excellent entry level DP with good build quality... if the price is right!
Good luck!