Robert -- I wrote an owner's guide and checklists for my 2015 Vegas 24.1 because I was disappointed with the generic manual from Thor. Several of the folks on this forum who own Vegas/Axis contributed comments, suggestions explaining how things work on the Vegas and Axis. When I completed it, I made it available to anyone on the forum who might want a cy. So far I've distributed about 275 copies.
It would probably be useful to you in explaining how things work and providing guidance on sanitizing the water system, winterizing, storing, etc. The checklists would probably be useful to you. The big difference is that in the manual section I have photos showing where everything is located (low point drains, heater plumbing bypass, Schwentek slide and lift controllers, etc). Those parts would not be relevant to you; however, you could replace my pix with pix from your Challenger and edit the paragraphs and you'd wind up with a unique Challenger Manual.
Send your email to
bevedfelker@live.com and I'll forward you a cy.