I too, would love to buy one or both of these guys trailers, but I have figured out that I am not a big truck/trailer kind of hobbyist.
However, I do know that a van trailer like this one would make a GREAT display unit for a museum operation to take a rolling exhibit to schools and other events. That's what I had hoped for the M348A2N trailer I had, but funding and time available didn't work out right.
So, the upshot is, if you know of a Museum group that could use it, donate it! Unless, like many of us, (READ THAT AS ME) you really need the $$ not the tax deduction.
But, in answer to your first question, My M348A2N data plate (same style of trailer-maybe different doors and/or frame) shows empty total of 9,040. 18" from the front of the van to the kingpin, and 74 1/2" radius from the kingpin to the landing gear, in case one of you guys with a tractor wants to make sure it will fit.