In a BMW R1200GS forum, I was asked about the 2nd trapezoid hinge that can be seen in the video above, about a center stand, and lastly the ability to easily roll the ADV1 into hotels and garages. I thought it might answer some questions here as well. Here is my reply:
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We have added a 2nd trapezoid hinge about halfway up the front of the trailer. It's connected to the hinge arms forming the triangle you mention. This design eliminates unwanted vertical side-to-side movement of the trailer. The beta trailers we're building now look something like this:
Please note that this picture is of our prototype, so it's a bit of a Frankenstein. In the photo above, the patent pending trapezoid hinges go into the trailer, where on the beta and production they will protrude out toward the bike by 3 inches. We are doing that so we don't take up any more space inside the internal storage. I want to be able to fit a laptop in that internal storage compartment. Another thing to ignore is, in the photo, we're holding our wiring on with duct tape...of course that won't be the case.
The biggest change there will be is the hitch arms are made of very heavy steel in the above photo, but they will be in aluminum in the beta and production models. There are a million other small changes that will happen: the bolts will probably be black instead of silver (we're looking for a vendor with reasonable prices), there will be a Schrader valve in the box where the wire is going through that will allow you to add/remove air from the air shock easily, the wire will be mounted better, there will be two additional internal storage boxes between the hinges, etc.
To address your other points, the ADV1 will come with a center-stand so it will be easier to detach and attach to the bike. It will also have a locking mechanism for the trapezoid hinges. That effectively turns the whole trailer into wheelbarrow. You hold onto the hitch arms and move the trailer backwards just like a wheelbarrow. However, from experience, if the gear isn't well balanced side to side, it can be tough to do easily. And the higher up the weight is, the harder it is to roll it around. So, I'd recommend removing anything you have on the top of the trailer before trying to roll it around.
Lastly, to your point of taking the ADV1 in and out of hotels and houses, the ADV1 has a quick release attachment system, so it'll be easy to attach and detach.
Hopefully this answers your questions. Let me know if it triggers any others.
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