Hi alsaun, and welcome to the forum.
In 2000 the "Challenger" was manufactured by a company called Damon RV. In 2003, Thor Industries
(Keystone's parent company) also acquired Damon RV and the "Challenger" soon became part of Keystone's
line-up. The current Avalanche line replaced the Challenger in 2010.
All that said - in addition to asking questions on the forum, if you'll do a Google search for "2000 Damon Challenger",
there's a few ads, some info & YouTube videos available which might also be helpful.
No, I'm not a Keystone historian
... our previous 5th wheel was a 2008 Challenger & we had
researched the line/brand prior to buying our first Keystone.
Hope this helps,
Terri, the Chevy co-pilot