Painting the outside of my camp trailer

[Clint L. Cranford]

I want to remove the old oxidized paint (40+ years old), and go back with a new paint in a camoflauge theme.  The trailer siding is all aluminum, do I sand it off like you would a typical automotive finish, or strip it with chemicals.  When the paint is removed, what kind of prep work (etching the aluminum or adding a primer) needs to be done before painting? What kind of paint do I use?  Any and all suggestions are appreciated.  I could take it to a body shop and have it done, that would cost more than the camper is worth.  This is definitely going to be a do it at home weekend project.  The end result doesn't have to be beautiful, I take this thing where most people won't take a typical off road vehicle.