All good and excellent advice here. I have a 2003 winnebago mini 24v. There is no transfer switch. The AC must be plugged in as shown above for the generator to work with the vehicle.
But not related to this stuff, check your over head bunk area for leaks on the sides. This vintage winni is subject to insuffecitnt seal at the corner molding below the side windows of the over head bunk. Seveal other owners of similiar yoar winnies have share this with me and they were right. Gotta seal it up with Dicor or some other method. I completely removed the molding and coverd the corners with eternabond then replace the aluminum molding.
PM if you want more details.