It looks like a pretty cool trailer in remarkably good shape from the exterior! My biggest concern is that it sits on a pipe frame.
A 'pipe frame' has a center spline down the middle lengthwise & "fish bone" outriggers cantilevering off on the sides opposed to a 'ladder frame' which has two members going the length of the trailer with "ladder rungs" going between them. The ladder frame is a better design structurally, especially on these longer ones - they switched over to ladder frames throughout the line in 1950+/-.
If it were me, and I were to purchase a trailer with a pipe frame for restoration, I would definitely change out the frame to a ladder frame because any added weight could overtax the pipe frame - especially if it has been stored outside. I've heard of people with old pipe frames that when hitched up to a tow vehicle, it pulls the pipe right out and leaves the trailer & outriggers behind because of the weakened connections to the spine - kinda like de-boning a fish.
You may have already come across the Vintage Photo Archives
website, but if not there is lots of good info there too. Since there are so few of them check out info on similar year/length trailers too.
Good luck in whatever you decide to do! We all love photos of these oldies - do you have any of the interior?