SoCal sun with me, and yes, not as bad as what you get in AZ! Based on a recommendation of a friend with a 5+ year old Maggiolina, he HIGHLY suggested finding the best boating fiberglass cleaner/protectant with UV protectant and use it very regularly! From memory, I settled on Meguiar's Flagship Premium Marine wax I apply it twice a year and while my tent is JB is barely over a year old, it still looks brand new...and its a white top. Once clean, it's only a 10-15 minute job to apply and remove the product. You aren't doing a large area! ? Another option is to have a custom cover made to protect it. I've used the little cover JB ships with during the hot summers here. I think that cover is really only designed for shipping, and perhaps storage to keep dust off? It's holding up great.
