Hi y'all.  I've got a 1997 steel stock trailer that is starting to rust.  It's black, so I wouldn't mind repainting it a lighter color anyway!  I'm not likely to keep it more than another couple years... I want to move up to a stock/combo or enclosed trailer but for now this will do the trick.  I just want to stop the rusting process.

I can't afford to take it for professional painting.  I'm hoping there's something I can spray on with minimal prep time (some sanding but not down to bare metal) that will be opaque, and serve as both the primer and the topcoat?  It doesn't have to be glossy, it can look home-done.

If you have any products to recommend, can you please include a link??  Thanks!