You need to head to an Auto Sound Installer shop. They know what fits and how to wire it.
You'll find Winnebago dealers and Winnebago owners don't really know your motorhomes current setup to know what is needed to change it to something else.
It's likely that a few of our members have the same motorhome but not likely that any of them have had changed out the stereo/infotainment system themselves. But you'll find that Car Stereo shops do this all day every day.
You can call Crutchfield and they'll help you as much as they can, but they don't really have any knowledge of your current installation.
Here's the wiring diagram for the front end of your motorhome:
https://www.winnebago.com/Files/File.../000207485.pdf
You'll find the Stereo and camera wiring on page 7 of the PDF
Here's a screenshot of that page:
Linear Mode
