Best Wax for Fiberglass Trailer?

So I've been thinking about the execution of this project and I'm trying to figure out how I'm going to reach the top center of the front cap to wax it properly. My roof isn't really walkable, unless I have a way to spread out my weight, like plywood or something and standing on a ladder on the side makes it difficult to reach that area.

Any tips? I've never attempted this before. I just bought a buffer and I'm thinking about leaning off the ladder with that thing trying to get to where I need to go to wax the whole front cap and I'm scratching my head on the best way to execute.