I just use the 100w panel/charger/controller combo I got from Harbor Freight. I think it was somewhere in the $100-150 range (it was a while ago). It is not super portable, which about a 2X3 foot panel which I store on the RV bed when towing, then set up at camp. It keeps the batteries charged for use when dry camping. Enough to run lights, furnace, water pump. Sorry I don't have a link - but I am sure you can find it at the HF page.
i'm running the Renogy Solar 300 Watt solar kit on my 22" RV. i've had it for a few years now. No problem at al.
Started with 100 Watt kit, and then added 2 more panels. (because i had the space).
300 Watt is a bit overkill as i can fully charge my duo-12V batteries by mid morning after draining it all night. https://www.renogy.com/renogy-100-watt-12-volt-solar-rv-kit/
Easy to install, comes with everything you need. There's also Portable kits and flexible panels now available as well.
I went with Zamp for my RV since it's prewired for it. I have 300watts with one roof mount panel and one portable. I have the 2000watt inverter, and with 4 6 volt batteries, I run satellite tv and all the rest of the normal trailer stuff. It is a great kit, but not the cheapest.
Renogy Wanderer 30amp Charge Controller with battery temperature sensor. Battery is VMax Tank 125amp hour . This battery has a 10 to 12 year life span.
I'm running 2 100 watt Renogy Portable Suit Case Panels (one 100watt shown) were I can run them together or just use one 100 watt panel. I have 20ft of 10 awg cable to move the panels or panel were ever need to.