I lived in one just like it for a couple of months, baby-sitting a barn full of chickens. A diet of eggs and beer made it a little ripe in there in cold weather!
tincantourists has an awesome supply of vintage trailers.
I'd love to get a hold of that 47 Packard! It needs a heckuva lot of work for the money, but it sure would be sweet! Best part is it looks like you could flip it over and use it as a boat.