Yup you have it figured out. This why it is usually recommended to go from controller direct on the battery so the solar can maintain the battery even when the switch is opened for storage. The other issue is that controllers prefer to have a battery connected at all times. Apparently no issues with Sunsaver.
Do you expect the solar to maintain the battery in winter? I would not trust it the way you have it wired. You would have to leave the switch on. And with a few days or weeks of no solar the RV could flatten the battery.
And right there generally is no use for the load side of a controller with an RV. You could invent a use but it is not necessary.