I started out with the Harbor Freight 3 panel set up. Used it one time and sold it at a yard sale for much less than I paid for it. they were to heavy, to bulky, to time consuming to set up and subject to theft.
For under $200.00 I purchased a 50 W Ramsond solar panel
and their controller on eBay.
I permanently mounted it on the roof of my 16' Scamp
and hooked it up through the controller to a deep cycle group 29 battery. I also changed all the interior lighting
Most all of my camping is in the boondocks, the system has never let me down.
Last September I took a 2 week, 4000 mile trip through Utah, Colorado, Wyoming and Idaho. On most days my battery was fully recharged by noon.
The only time I had to hook up the charge line from my vehicle was when I was caught in a 3 day rainstorm in the Tetons .
I have not noticed much difference when the sun is lightly filtered by trees.
Adding solar power
was one of the best and easier modifications I have done to my Eggs