The way my previous RV was setup, it had a cord hard wired as it looks like yours is and I used that to plug in for shore power, when I wanted to run the gen I had to plug my cord into the receptacle shown in your pic in order to get the RV powered off the gen and it also charged batteries too. As for the Frig, I always run with frig on even when in stations. Your tank capacity and your shower technique will determine how often you need to dump but I like others have mentioned always dump on the way home before I put RV up.
