Take lrsses' advice and see if you can find an owner's manual for your coach. I found a parts book for your coach and it's pretty impressive. I've attached it below.
Yes, on page I-14, it does list your roof as being fiberglass.
Each person has a different routine and uses different products for their fiberglass roof. I clean fiberglass roofs every three months (more if I have time and am physically able ...getting old so it's tough now). I used to use 303 on the fiberglass surface but now use NuFinish as it is easier to apply for me and has some good UV protection. I still use 303 on a lot of things and buy it buy the gallon containers. Like I say, everybody is going to give you what they use and you'll have to weigh the pros and cons and come up with what you like.
One piece of advice, if you clean your roof regularly --don't let it go any more than six months-- it makes it an easy job each time rather than doing what some do and let it go two or three years between cleanings.
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