I actually bought a solar array for a trip to Africa a couple of years ago (https://www.amazon.com/gp/product/B071G4CQSR/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1) but after receiving it and thinking through the issues I decided to leave it at home. Gave it to my son, actually. First, it was fairly bulky to haul; nearly impossible with my self-imposed one-small-bag luggage limit. Second, in thinking through its use I realized that I could only use it on days where I could lay it down all day in the sun. IOW days where we'd be in a camp or lodge more than one night. Then, it needed direct sunlight where many camps work hard to provide shade to the tent areas. Finally, the space tradeoff again -- I could buy another ten camera batteries and end up with less weight and bulk.
So, for me, needing to charge only one type of camera battery and often being on the move, the solar array made no sense. For someone in a motor home usually parked for a day or more at a time, and maybe needing to charge more than one type of battery, things might be different.
The one I'm referring to is vehicle-portable, so unsuitable for your uses but very suitable for use with a car or RV like the OP has.
There are smaller ones like the one you link to, but those are both significantly lower in output and bulky if you are optimizing for flying. They're reasonably usable for hikers who are not limited by carry-ons though, and can be secured outside the pack to trickle-charge a powerbank while hiking.
The bigger the panel, the better it does in bad light. The Jackery panel will give you 20-40 watts even in grey conditions, and in direct sunlight it will do 100W, which is enough to run a laptop off of, and suitable for charging even a reasonably large battery.