Rexhall was/is an innovator in motorhome design and has pioneered many new designs, e.g. the full wall slide. They are a small manufacturer and sell factory direct, so no dealer support. Of course, you aren't going to get much support for an early 90's vintage anything, so that probably doesn't make any difference.
With any RV of that age, condition and previous maintenance makes all the difference in the world. If this is a well maintained unit in good condition - and it suits your needs - I would say buy it. If not, forget it. You don't want to have problems with an old coach that was built only in very small volumes, cause nobody knows anything about it.
2004 American Tradition; 2014 Buick LaCRosse
Homebase in the Ocala Nat'l Forest near Ocala, FL