Hi John,
Since Newell Coach does not have a NADA value it can be difficult at times to establish a used book value. What you need to do is find coaches of similar years and compare them in all aspects, Interior, Exterior, Tires, Engine, Transmission. Test oil samples etc if your are serious about purchasing a specific coach. Also the more questions you ask about the Newell your considering the more we can help you establish a used value. Below I have given you a site that can help you and a link to a discussion we had prior on used Newell Coach Values.
Hope this helps,
Sean
This site will help you establish a base for used values
NewellClassifieds.com
Also please see this additional thread called used newell blue book values
http://www.luxurycoachlifestyle.com/...ok-values.html