While doubtful of all the miracle claims made by the ceramic coating industry, my opinion of paint maintenance is 99% of the success lies in just doing it. I've used all kinds of products from cheap to expensive since the 1960s and all my vehicles looked nice. This past year I've used a couple products with the word "ceramic" on the container. For me what counts is ease of use. The harder a product is to apply and remove, the less I want to use it. Years ago Teflon was the miracle product, and it was on the label of so many products. Now it's ceramic. Use what you want, and don't expect miracles.
One day a couple years ago I was picking something up at the auto parts store and noticed a bottle of Maguires Hybrid Ceramic Wax which is a spray on, hose off finish. The guy behind the counter saw me reading the label and said: "That stuff is da bomb." Feeling adventurous, I ignored my "extraordinary claims require extraordinary evidence" self, and bought a bottle. I used it on my motorhome and my wife's car and was quite pleased with the results. It can leave a bit of an irregular/streaky finish at first, but water really beaded up and it seemed to last quite a while in the rainy Pacific Northwest. It was an easy, quick way to do a 40ft long RV in my driveway.
Now, I'm not specifically suggesting you need to use what I did, just commenting on the fact I was pleased with a particular product. I don't buy all the gee-whiz claims about ceramics, any more than I do the gee whiz claims on TV informercials about miracle non stick pans, or shammy towels. If you see a product that interests you, try it and see how you like it.
I see a lot of RVs that are cared for, and a lot that aren't. I bet all the nice ones are done with an assortment of products, new or old. The ones that aren't, are simply ignored by their owners for whatever reason. There's one in the campground I'm in right now that's a hybrid. It's pretty clean up to where the owner can reach, and filthy above that.
I've had two friends that believe vehicles are simply transportation and they have never waxed, and seldom washed them. As long as they run and get them from point a to point b, all is well. Their vehicles look like, crap, but get the job done. Others pay big bucks for regular detailing. I like a well maintained vehicle and enjoy doing it myself. I get comments all the time on how nice my 1998 RV looks, and it's because it has been taken care of, not because of the products used on it.