I've been reading the posts about the Radian SL issues. So far, I haven't noticed anything loosening with my install... that being said, if I do notice a problem, I'll switch to seatbelt install immediately. And that's where I have a question. I remember reading something (might not have been here) about you cannot do a seatbelt install in the middle row captain chairs in a 2011 Sienna - because the seat belt comes off the car wall, not the seat itself... is that true?