I agree with Robert. And I say that having re-conditioned the gelcoat on a number of fiberglass boats. At a certain point (which I would say your camper is past), it makes more sense to paint.
And, while gelcoat is nice, don't think that a good, two-part paint job is inferior. I think it can be every bit as good. A number of high-quality new boats are coming with a two-part LPU paint job instead of gelcoat these days.
There is a huge range of possibilities when it comes to paint - from Tremclad/Rustoleum and a hot-dog roller, to a professionally sprayed two-part job. Mostly you get what you pay for, but a person can do a nice job themselves, too
If it were me and I had no budget, I would tow it to a good shop and say "have at it" with a good two-part paint. Since most of us don't live in that world
I would do all the prep myself (carefully as prep is key, Key, KEY) and then take it to a shop to have them spray it with a good, two-part paint. For me that's the compromise that is the best of both worlds (with a realistic budget). Of course other people would make other decisions.
At any rate, I agree with Robert. Clean it up for now, get nice wheels or hubcaps (as others have said), and go camping. Then plan for a fun/good/glossy paint job down the line.
Also: Any paint job is going to require a fair amount of solvent-washing, sanding, fairing/filling, and sanding, so it will not increase the work by any meaningful amount if you want to do a bit of "spot" spray-painting now to cover the worst of the bad areas. That will come right off when you sand/prep. Wax will too (in fact, you want to solvent wash to remove mold release wax anyway - it will still be there 40 years later, amazingly).
Just.... no silicone!
And watch for it in "hidden" places like furniture polish and Armorall (it's not just in caulk anymore).