I have the Thule 835PRO folding kayak rack on 2012 OB. Only problem with the folding over the standard J is that the front of the rack is shallow and if you don't at the kayaks in just right they can move around. But I found if you cross the front and rear ropes to the opposite sides of the car they hold perfect.
I have heard of other people saying the cross bar clamps come loose, that hasn't happened to me, but just in case I put some blue loctite on the screws.
I have heard of other people saying the cross bar clamps come loose, that hasn't happened to me, but just in case I put some blue loctite on the screws.