Whoa ...... You are NOT looking at a 2006 Monaco Cayman, if it is a 40' model with a RR8R chassis. No such creature existed. This must be a Monaco Knight or Diplomat. Check which engine it has to confirm. The Cayman came with the 300 ISB only and the Knight came with the 325 ISC as standard and could be ordered with the 400 ISL. You have a much better chassis and ride with the 8 bag RR8R chassis plus everything else is upgraded. Get the VIN or the Monaco serial number and call the number Dennis gave you. They will tell you exactly what and when it was built plus send you the actual build sheet for the coach. You may have just come across that needle in a haystack find .......
http://www.monacocoach.com//library/2006/2006_Knight.pdf ----- Brochure 2006 Knight