There were 4 models that year - Suncruiser, Sundancer Sunflyer and Sunrise. The Suncrusier and Sundancer had a 22 ft model. You can look them up in the NADA RV book to get an idea of the value for the value.
http://www.nadaguides.com/default.aspx?LI=1-25-38-5692-0-0-0&l=1&w=25&p=38&f=5694&gc=rv>c=MH&m=0190&y=1992&ml=I
31,000 miles is very low, which is a good news/bad news thing. It probably is not worn, but a lot of things deteriorate from lack of use, and a seldom used RV may not be kept in top notch repair either. You will have to use your judgment.
Check the RV Forum library for Checklists for buying an RV, especially a used one. Check everything CAREFULLY. In particular, check the date stamped in the tire sidewalls (see Tire Date in our Glossary for how to read the date code) to make sure they tires are not over 7 years old. Old tires may still be good looking, but they are like time bomb. The might last only a few more miles or they might last another year, but they are going to fail and do so in a catastrophic fashion.