At $14 bucks, if it doesn't work out, your not out a ton of cash.
It's compact enough, can be tied off close to the batts, not so large as to attract any "rats"..
We have a 19ft 2014 jayfeather. We purchased our solar battery charge while on a trip in Canada from Canadian Tire - a great store and the most helpful staff we have met on any trip. They advised us to get a Coleman and recommended the amp size. I think this is ours, but it cost less than he price here. Use it while on the road and while the camper is in storage. https://www.amazon.com/Coleman-Solar...attery+charger