One of the accessories Pasq is making for the ADV1 is a collapsable shelf. Here's a drawing of the shelf from underneath. You can see that there are two arms holding the shelf up. These arms rotate out of the way, allowing the shelf to fold up, flat.
Why do it with arms like this? We didn't want to have a simple cable holding up the shelf (like you see a lot in adventure trailers to be pulled behind Jeeps) because then nothing would be able to hang off the edge of the shelf, like a dry bag or something like a cooler that is just a bit wider than the shelf.
Here's what it looks like folded up:
Here's what it looks open:
Here's what it looks like carrying a suitcase:
And here's what it looks like carrying a cheeky puppy!