Just guessing as my MH is totally different, but you did not list a switch for the traditional outside light. In some coaches, there is a switch by the door and on the dash that both influence a cab light. I say influence in that they are not two way switches like you have at home, so both have to be set to on for the light to come on and either can turn it off. Again, just guessing.
2015 Thor Outlaw 37 LS
2013 Ford C-Max w/Invis-a-Brake
2016 HD Freewheeler