Oh, one more thing. Let's be clear about this. The rear door/tailgate does not even come close to smacking anything on the roof. Nor would it matter as much, since the tailgate would be mostly open then and the gate is an inherently strong piece of the vehicle that won't just snap off when it hits an object. I have had this problem with other vehicles and it isn't much of a problem at all.
What we are talking about here is the plastic (flimbsy) spoiler that due to its location/proximity to the roof, will hit things on the roof when the door is maybe 1/3 open. And there is a good chance of the spoiler getting ripped off. Ultimately, this is a problem that Toyota should fix and other buyers should be aware of.
In the meantime, I'm going to give the Q-towers a shot over the driver cab area to see if that can remedy the problem.