The Rexhall factory and service center is in Lancaster, CA and, AFAIK, is still in business. They no longer sell thru dealers but only factory direct. Rexhall owners are fairly loyal and positive about the brand. I've always liked Rexhall products because they seemed to be at the leading edge of industry innovations, but they have never been very popular. Distribution and financial issues over the years may be the cause.
There are a lot of orphan brands on the market today for which there is no factory support whatsoever, but owners are still able to get parts for them and get them serviced. That should not be an issue.