D.W. you asked some great questions and those are many I (et al) have wondered about. Additional, we are getting to the point in "timber framing academics" where solidifying how we classify (or perhaps taxonomize would be a better term) the different frame styles now and through history, perhaps breaking down "form" (aka genus) and "style" (aka species) in a more clarifying fashion. I know this topic has come up a few times among academic architects and social anthropologists I know.
As for "type" which I have come to understand architecturally as "form and styles" there are very distinct Dutch, Germanic and related timber frames that are clearly identified not only by chronological placement but structural elements as well. "Ankerbalkgebint" is one such form, comprised of several styles with key feature elements such as"ankerbalk," often used (and debated) to identify them within historical time periods, and cultural placement. The "Ankerbalkgebint" is not just religated to Dutch and/or Germanic culture but further has developed (actually way before the Germanic forms) in other cultures as well, and of course, under different nomenclature. Yet one could reason that the Germanic forms are the most "distinct" in character and individual style, as a primary timber element within those frames.
The "term" itself is allusive to me, yet as I study deeper into the Germanic and Asian history of this form and style of timber framing, I am sure to discover more. You and many of us are still perplexed why the majority (not all) get both trunnel and wedge. As I spoke of earlier, the consensus thus far is that the wedge was employed to draw the joint extremely tight and then the trunnel bored and placed. The "horizontal" configuration of the joint as shown in the shared video I only find in furniture and in very rare Asian timber frame joints (actually I can only recall one from memory in a roof system and perhaps another in a ship's assembly??)
"Dutch Barns" (as they have become known as here in the United States) are indeed a very strict building form of several styles within the historical Dutch - Germanic Timberwrights that settled certain regions of New England, with a concentration in New York, Pennsylvania, New Jersey and outlying areas. Now rare do to neglect and alterations in their pure form, they are distinct and easy to recognize in "form and style" by those that study them in depth.
