I, like many others on the forum, am trying to increase the amount of time I can camp in my 2021 320 Boondock without being plugged into shore power. One option is getting an external solar panel to supplement the factory installed panels. Some people have mentioned a Zamp port that an external solar panel can plug into. Is this something I have to get installed or do I have one already? I have looked high and low but I'm really not sure what I'm looking for. Thanks.