Nice comparison!
There are quite a few tents that fit the stock bed rack nicely. The benefit of the iKamper (non-mini) is that you can fit a family of 4 in it with the king-size mattress footprint. That's at least why I spent time shoe-horning it onto the truck. heh.
It's definitely possible. I have a iKamper 1.0 (kickstarter) which has the same roof footprint as the 3.0.
Basically 3 options:
Worst: Stock bedrails.
Like others have mentioned, this creates a cantilever over the rear of the truck that is pretty sketch. I've seen some people create a...