In my spare time I am putting together some info and schematics of the Sd.Kfz 10, and when ready, will post it as a Wish List item. Hoping I can help Rubicon with some of the research, and lay out a proposal that catches their eye! I've got several good books on the subject, and hope that I have enough to lay out the construction, major models/changes, along with production numbers, to convince them we need such a vehicle!
One of the things they towed is that nice looking Nebelwerfer coming in 2019! And I like that they have a 20mm quad flak, because the Sd.Kfz towed those as well. And a single barrel Flak was built on to the back deck of certain models (and removable down ramps).
But that is indeed for another thread!