[unwind]

The fake camera rig is mounted using bolts in holes drilled in the (rented) car's roof rack. That's not how you typically mount stuff to a roof rack, perhaps it can make it more "part of the vehicle" than "cargo" in the eyes of the law; I don't know.

I failed to see the point of the project altogether, and found it rather rude to drill in rented equipment, too. I'm sensitive like that.

[icebraining]

Why do you assume the roof rack is part of the rented car? You can just buy a rack and put it on the rented car.

[unwind]

That's true, of course. And they do list the rack in the list of materials.

I mis-interpreted "If the car doesn’t come with one, rent or buy the specific roof-rack for that car", which still mentions renting the rack as a solution, of course, even if it seems they actually didn't rent the rack they used.