Welcome to the Forum.
We have a 2016 Vegas 24.1, the dash Radio Thor switched to is the Axxera AV614BH (axxeraaudio.com). It handles the three cameras, it also has a lot of bells and whistles...some that were not hooked up by Thor (you can run two Video Outputs from the dash DVD player if you run the necessary RCA cable bundles when you do the instalation). Also there is a mirroring hook up on the back that needs to be run to the front of your dash for easier access (Thor did do that).
Sheree & Michael NCNG LTC(ret) with Munpi and Sheba (cat).
2016 Vegas 24.1 E350 5 speed "Ms. Enterprise", Bug-Guard Screen, Recliners, Infotainment Center, HUD, ARC Shower Rod, Safe-T-Plus, Curt SpareTire Mount,Tornado Black Tank Rinser, ext. WiFi Antenna, Roadmaster Tow Sys& Invisibrake.