You shouldn't have to replace an entire trailer skin. If it is just brushed aluminum you can take it to get an acid wash once every year or so. If the skin has white/black or colored vinyl over the aluminum you can call sooner and ask for a replacement vinyl. You will then have to take your trailer to someone who installs vinyl wraps for a living and who can give you a warranty should something happen. If you're skin is damaged and need replaced you'll have to call Sooner and ask for a price to get it professionally repaired.
its all vinyl! the skin itself wont need to be replaced, it just needs a good cleaning, but the windows and manger doors do! they have some holes in it.
I have a repair shop that's going to do a quote for me, I just want to get a bit prepared at what I'm going to be looking at! so I'm not so shocked haha