I think there are lots of these old vintage trailers sitting around out there that can be found and restored back to a useable condition at a fairly reasonable cost. Find an old trailer that you like the looks of, or one that has some character. If you can find an old trailer with a semi solid structure at the right price and you like the way it looks it can make a fun vintage trailer restoration project. I say go for it, you only go around once, have some fun!
Happy RV Learning,