Not a chemist. My comments/advice is worth exactly what you paid for it.
Rain-X Complete Surface Protectant - (google it) may be a different compounding? It is for all surfaces. It does really bead based on my experience. FMCA, a fairly well respected RV organization of quite a few years, as part of its member services promotes a coupon to its members for free Rain-X Complete Surface Protectant application at Blue Beacon. Blue Beacon, besides washing some trashy trucks, also washes many that have finishes equal to or better than some RV finishes. Point is I don't think BB would be able to successfully offer, over the years, a product that doesn't do a good job or a product that chemically would harm these expensive finishes to RV owners, via FMCA, or to some pretty picky freight haulers.
My BB washed 7 y/o RV has been Rain-X'd many times over the years. I see zero evidence of any damage to the clear coat from either the Rain-X or BB in general. 90% or more of the people who speak with me about my RV are shocked, based on exterior appearance, that it is not a current year model. Maybe they are all just being courteous and kind but I think not.
JMO based on use.