In the boating world, one popular product is Poliglow, which will certainly restore the glossy finish to fiberglass. Some boaters do not like it though as it can yellow if you apply consecutive coats from one year to the next without removing the old coat.
You also have to get all of the old wax off and start out with a clean piece of fiberglass.
So I would try just a small area first and see how you like it.
A few people have used it for motorhomes as well. If it's fiberglass (at least gel coated fiberglass), then Poliglow will shine it up.
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