Thanks for the reply,
I couldn't find anything on Winnebago's Spec Sheets either. My build sheet lists the Jensen Radio, maybe the prior owner changed it.
Researched: RVCams.com, Velvac, Sony and Winnebago Customer Service. The side cameras are definetly powered by a switcher.
Ron from Winnebago provided assistance in removing the Bezel and I found a Voyager CSW3 Switcher. After checking each camera with the one working input, put it all back together and was surprised that everything works.