We have a 17' hybrid. I changed all lighting to led, purchased a 80 watt solar panel with controller from Solar Power Canada. Good price, excellent quality. We dry camped in Northern Ont for 25 days. We never had a power problem. The battery was fully charged every day. Even on overcast days the panel was charging the battery. On sunny days by noon hour, the controller was spilling off excess power. I attached telescoping legs so I could move the panel around (to be in the sun) as opposed to fixing it to the trailer.
So much better than when you are in a quiet, beautiful campground and some tv freak cranks up a generator to watch I love Lucy. I'll add a pic of the panel