a frame to a trucks comes out to being about 400 when i did my big gooseneck which was 28 ft it took me most of a weekend. so not really sure depends how bad the rust is. if i am striping paint not as long as if its a shit tone of rust.
as far as powerd coating no i work with a friend of mine who does powdercoating so i send my customers to him.
trailer would probally be around 450 or so. as longs as its striped you want just what you can see or do i have to flip it as well? my auto flipper is at my cousins house right now so i would have to flip it by hand which means work which means money. if you bring a bare trailer to me ( which i can pick it up) that means no axels or wood. iw ouldnt cost that much to do.