2018 Elkridge 37BHS Solar Prepped

Our new to us recently from June of last year, 2018 Elkridge is solar prepped. It has a connector on the exterior of the camper. My question is how can I attach an exterior solar panel to keep my onboard batteries are staying charged? Also second question. How are some of you attaching solar panels to your roof and to prevent leaking. I don't want to start a leak situation. Thank you in advance for your attention to this matter.
 
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