That would be cool if the controller did that. We go on one or two dozen trips a year, so our battery is at 100% most of the time out camping. On the last day or two, I can disconnect the truck-camper plug through one of the turnbuckle ports. It's not super easy, but doable. Then it discharges down a bit. We don't have solar on the roof -- just portable solar.
which controller? Link to the manual?