I have been absent from here for quite a while now and just wondering if there are any new high weight/height RF seats that tether? Do we still only have Britax & Diono? DS is pretty much at the height limit for his advocate and we are about to take a 7hr road trip. I'm just not sure if I'm comfortable with him in it at this point! I have an xtsl but I don't love it anyway, and I'm not sure I'm getting it installed right, angle and all, in my Sienna...not so comfortable using that one just because I'm second guessing myself on the install/recline!!