Those "gum eraser" wheels are the only advice I can give. Sounds you are on the right track. And as you discovered, when removing the decals, there will be a shade difference where the sun faded the gel coat.
Over time, the fade will subside as the previously protected area fades from the exposure to the sun, but it will never disappear completely. On fiberglass boats, when sometimes the owner changes the name on the stern, you can still see the old name outline years later if you look at the stern at a certain angle.
So I can understand you wanting to paint on the stripes as covering them in the same pattern will be the only way to keep the faded areas from showing.
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The only thing that works on a RV is the owner...
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