Stain & Paint Compatibility Question

Once the wood dries out, we need to paint the jumps. Since the jumps will be constantly exposed to the hot Florida sun and rain 365 days a year, we want to weather-proof the wood as much as possible, not only to make the jumps last, but also to minimize the tedious and time-consuming job of frequent repainting. The base color of the jumps will be white but there will also be one or two other accent colors on each jump. Below are some photo examples of ways simple, basic jumps can be painted.

Oil based primer (to seal the wood tannins) and latex exterior paint ( for the white sections and accent colors) was recommended. However, since exterior wood stain penetrates and protects wood from the elements better than paint (and doesn't chip and peel like paint), I'm wondering if we could use a solid (white) exterior wood stain INSTEAD OF the primer and white paint....... and then paint the accent colors using exterior latex paint OVER THE SOLID WHITE STAIN.

I'm thinking if we could get a good, solid, weather-proofing foundation (like with solid white stain) over the entire surface of each jump, we could not only skip the priming step, but then we might also only have to periodically repaint the accent colors. Refreshing just the accent colors every few years seems like it would be easier than repainting 8 complete jumps.

I asked the (*paint professional*) manager at one local Sherwin Williams store about the advisability of using white exterior solid wood stain instead of the primer and white paint and he wasn't sure. With 30 acres and 22 horses on the property, we already almost have more work than we can handle so anything to minimize maintenance and upkeep is always helpful.

I definitely don't want to create more work for ourselves than necessary by doing something that isn't going to work from the get-go, or won't hold up.

Does anybody with paint experience know if we could use solid white exterior stain and expect the latex exterior paint to stick to it, long-term? Do you have any additional thoughts? Suggestions? Advice?"