Used prices are very difficult to pin down. There's variances from region to region, coach condition, how the coach came to be on sale, water leaks, wear, builder no long in business,,,. NADA and other such pricing services can be used as a very general guide and your DMV will use it as a guide to setting tax or other such rates regardless of the super deal you negotiated.
When you go and look take a lot of pictures, post a link here and ask for opinions along with as much data about the coach you can get out of the seller. Find the date codes on all the tires and if the coach has maintenance records. RV's aren't a high volume sales item so you have time to formulate a price.
The number one item to consider. If you can get the price you want or something just doesn't feel right, walk away. You can love a coach but it won't love you back.
2006 Hurricane 31D built on a 2006 Ford F53