Depends on if you want it mounted to the RV or not. If not, Harbor Freight has a set-up that will work & can be daisy chained to increase output even more <
https://www.harborfreight.com/100-wa...kit-63585.html >. I did not want to mount panels on my roof, as I did not want to drill holes up there (more potential for leaks). I was going to use two of these while out dry camping as my (factory installed) solar plug on the trailer lounge can support up to 200 watts. I would just pack it up & store it under the master bed when no in use.
I used to have two panels (about the same size as the 4 panel set-up shown in the link) on my Palomino truck slide-in pop-up camper for the two deep cycle batteries I used in it. It worked well during spring - fall, but would not get quite enough to overcome the smoke & CO2 alarms that would be on (due to wiring) while charging during the winter. But doubling the panels, or re-wiring so there was no draw would have resolved that issue. I ran that set-up on my Palomino from 2003 to this past spring when I sold it & bought the T-30F. On the T-30F I installed a battery disconnect to resolve that issue.