I have a 1951 M-100 that I bought a few months ago. I wasn't looking for one but when I heard a guy on my local radio station's call-in "Tradin' Post" show say "I have an old Army ammo trailer that you pull behind a Jeep that I'd like to get $150 out of" my ears perked up in a hurry. I called the guy and 2 hours later was the proud owner of a 60 year old trailer!
Mine's not perfect. The brake handle and landing leg are rusted and there's some rust through along parts of the tub. Nothing that can't be fixed though, once I have some spare time.
If the trailer you're looking at still has the lunette on it (the big ring on the hitch) be sure to budget for a pintle hitch for your Jeep. Buy one that will raise the trailer tongue enough that it sits fairly level behind your Jeep but still lets your tailgate open. I found a truck supply house in MI that I ordered my pintle from. Ordered it at 3:00 pm and UPS pulled up in my driveway at 2:30pm the next day! If you need the name, post up and I'll go through my records for you.
Also, I noticed that you're running 32" tires with 3.07's. That's going to affect how much you'll be able to comfortably pull in that trailer. But, that M100 pulls like a dream behind my TJ.
Good luck getting it!! If you're able to buy it, post up a pic or two.