I did preview them from outside on a pick up from earlier this year. They have 8 of them.
The dollys are definitely modern and I would have no issue using them on highway speed. Modern tires, air brakes, air bag suspension.
Nothing at all like the old m832,m833, & m840. Looks like a much lower center of gravity. I believe it had 12v & 24v trailer hook ups.
The rep told me they were mostly used as office configurations. They were all sealed up so I did not see in them but he told me they had heater/ac units in the nose along with the on board gen set.
They looked liked in new condition and not beat up or abused. It looked like the dolly used standard conex box hook ups for the box placement. Not positive but that is the impression I got.
These are the first I saw sold complete. GL had some dollies sell out of Eglin a while back. The 2 half's nestle together with no load.
I have no interest but If I had the room to store, I think they would make an awesome camper or portable hunting lodge.
If you have any questions, Let me know or send me a pm?