I am not sure if you are aware of it's existence, but there is a vinyl decal removal tool you can buy that is a common item in the auto body industry. It looks like a wheel that you can chuck into a drill and it will strip off the graphics.
They are available at body shops or sometimes on eBay.
Remove Vinyl Pinstripe and Graphics Eraser Arbor | eBay
If the coach is new enough, you might be able to pull the graphics off in sheets for the most part, then touch it up with one of those tools.
It does take a bit of finessing though to use the tool. You can burn the fiberglass if you overdo it.
I removed about 200 running ft of vinyl graphics with one of those wheels on my last boat as they had deteriorated over time.
It still isn't easy with a removal tool, but it can be done with enough patience.