I don't have a specific recommendation but, as a former sailboat owner, I prefer products intended for fiberglass boats. There's nothing unique about RV gelcoat and there's a lot more options in the marine marketplace. Here are some examples:
I use a product called Gel Coat Wash and Wax sold online as well as at most RV supply stores including Camping World. Comes in gallon bottles. Was and wax in one step. No towel drying required. Streak free drying. Can be used in the sun as well. Leaves a beautiful shine when dry protects gel coat front oxydizing. Good luck. Also Fantastic is good cleaner for water spots and won't take the wax off either!