I have a coworker who has one of these trailer sthat he is gonna give me for free:
http://www.olive-drab.com/idphoto/id_photos_m416.php3
It does have a lot of rust and will need some work, but hell, can't beat free. I might have to turn it down if I can't find a place to keep it and work on it!! It would make a great, cheap little project to work on!
Jack