I have a 2020 keystone premier and like most the manuals spend more time covering there butts on safety. Anyway mine has a plug and says solar? So do I get a panel and plug in? Where do I find info on this ?
What BarabooBob said, I found the similar receptacle on the front corner of my Coleman, a 14 ga wire pair zip tied to the main battery cables. There's no controller. The actual plug was a ridiculous price at the dealer, but you can get them here. You may still have to insert a controller at the batter(ies) https://www.youtube.com/watch?v=yxYGaQX5GSQ
Most RV's that claim to be "SOLAR READY" only have a plug on the outside of the RV that leads to the battery. Most do not have a controller and many have wire that is not heavy enough to avoid a voltage drop between the panel(s) and the battery. You also must check the polarity on the plug to make sure you don't damage equipment or blow fuses.