National made good coaches. As far as it being no longer made, just look around you'll find more brands that are orphans than are left in the business of building new. Most parts of any coach are made by vendors still in business and many National specific items, such as fiberglass parts are available.
2001 National Tradewinds 7370 300 Cat
2011 Jeep Wrangler Unlimited Sport
Officially fulltiming. The Journey Begins