Go to the NADA website and search those models to see what the current sales process are. Then go to national and local and national CraigsLists and do the same. This should give you a fairly good idea of prices.
Note: Jaycos keep their resale values pretty well and have up to a 5% higher resale value than other brands.
My posts shouldn't be taken for factual data, and are purely fictional, for entertainment purposes, should not be constituted as related to scientific, technical, engineering, legal, religious, spiritual, or practical advice. After all it's FREE! Amen. :W