Great find Mrcat88!
We currently have one of these...
Sportz Large SUV Tent ... but it is a pain in the @ss to set up, and tear down (heavy when wet and muddy)....we sleep in the back of the FJ.
Here's my idea....a canopy like you found that fits in a bag attached to the back of the rack. You zip it open, expand, maybe place two poles and a couple of guy wires at the end, and you are done. (The same concept as a rooftop tent, but for the rear of the FJ). Pull it out, tie it down, done.
I'd like it to be big enough for a couple of chairs to fit in and be screened around the sides for insects.
Thanks for the links, it gives me more ideas!
Wonka