Yes, it is unique... I have only ever seen a couple of them out in the wild.
Valuation will be difficult, as there aren't a lot of comps out there. They are also highly desirable, as they have a fuel-efficient 6BT Cummins ISB *and* they actually have a tow capacity, provided the trans is taken care of.
Sorry I can't help on the price. If timing were different, I'd probably be interested in the unit.
Resurrecting an inherited 1980 Minnie Winnie 20RG from the dead after sitting since 1998..