Paint Travel Trailer?

Most of the work, if you want a result that looks good, will be preparing the surface, getting down past the oxidized original paint, and quite likely priming over exposed metal. I'm assuming original is aluminum, which would have had a baked on finish. There was a market for this, repainting aluminum siding, but now the trend is to pull it off and replace with vinyl (residential market).

With good prep, and skilled use of modern paints, you can probably get something that looks better than the original, but it won't be cheap. Go for cheap, you might not like the result.