I just pulled the Axxera AVM80 radio out of our brand new 2019 Thor Four Winds 23U. I was planning on putting it on eBay but figured I'd check here first to see if anyone wanted it.
It works fine; I wanted a CarPlay compatible head unit though so I swapped it out for a Pioneer unit. The harness is already spliced into a standard Ford radio harness that the E-Series uses, but keep in mind that some of the power connections in a RV don't come from that so you'd likely still need to splice a few wires in.
See pictures at https://imgur.com/a/tcglSRI
$25 plus shipping