These repairs were made almost four years ago, they are holding up well after hundreds of thousands of miles.
I had the advantage of being able to work from the back side on the hoods, which isn't practical on your RV, but it isn't a big deal.
Your repair would be significantly easier than these hoods.
The difference mainly being that the panel would have to be thinned out a lot on the front and then several layers of fiberglass would need to be lain up to restore the thickness and strength.
I would not use typical polyester resin, but SMC resin, it is vastly superior for these repairs.
(Unfortunately, it looks like I don't have any pics of the actual fiberglass work, just structural reinforcement and the finished product.