How to paint an aluminum travel trailer?

I've bought a 1988 Sunline Travel Trailer that I want to paint. Its aluminum and just looking for suggestions. I really don't have the money to have it painted professionally but I would like a professional look.|||Sorry but I have never seen one of the aluminum trailers home repainted that looked good. This is a job for professionals. Why don't you go to an auto (truck is better yet) supply to get aluminum cleaner to shine it up?