Michelin still makes the XZE in that size and shows it on their RV tire website. And many other major tire brands offer that size as well, e.g. Toyo, Hankook, Goodyear, Bridgestone, etc.
As for the XRV model, Simpletire.com still shows it as available but who knows if their website info is up to date? Maybe they just have current warehouse stock. When I look up 245/70R19.5 on the Michelin RV site, the XZE is the only recommendation that pops up.
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL