@dagaad, here's my backup camera install on the rooftop fan cover.. https://tab-rv.vanillacommunity.com/discussion/13734/wireless-backup-cameras-monitor-added
As to a backup camera, we are downsizing from a 27' Lance to the Tab. My partner is not very good at directing me while backing up, so the camera saves the marriage.
I may be the odd one here, but in three seasons I've never used our backup camera to backup. It's more about keeping track of traffic behind me (tailgaters) and the gear mounted on the back of the T@B.