Larry,
You are in error about Thunder production. The very popular Thunder option to the Patriot line was never stopped after it was introduced in the late 1990s until the Monaco bankruptcy in 2009. In fact there was at least one 2010 model Thunder that Navistar finished after the Monaco purchase. Towards the end of Monaco production, the Thunder was the only Patriot that was manufactured.
If you are using the Monaco website as a reference, it is very incomplete. You can find a list of all Beaver coaches that were manufactured at the Nada website under the used RV price guides.
Gerald