To the folks discussing solar. Replacing a tiny panel with another small panel is not the best route. Adding a decent amount of solar charging potential is quite easy. There are many Youtube videos that provide good technique and tips. These aren't much different than any other Class C RV. First thing is to make the roof nice, all patched up and clean then attach the panels (maybe a 100 watt panel, or 2- 100 watt panels or a 160 watt panel. Buy from a reputable name, there are several.) Run the wiring to a controller then to the battery(ies). It's a good time to add a second battery. Along the way remove the little trickle charger panel. This is a quick video done by RVerTV, it shows a rudimentary solar install. I would try to put the wires down a vent instead of straight through the roof. He had his reasons for doing that of course so you can figure out how you want to run the wiring for your rig. https://youtu.be/p5BmUA5Dnjc
There are many videos like this one to help figure it out.
