No problem... I thought that must have been what you meant. What year is your vehicle... are you sure there are no tether anchors on the back of the captains chairs?
My van is a 2006. There are tether anchors on the back of the captains chairs, but that is currently where my other 2 children sit. I could move them around, but it is a lot easier to reach my RFing kids when they are in the 2nd row as opposed to the 3rd.
I'mnot familiar with the center 3rd row of the SV6...what exactly is it that makes installations hard? Is the seatbelt forward of the bight? long bucklestalks? Fixed bucklestalks? headrests which interfere? What is it?
Also... honestly,the Nautilus intsalls REALLY easily, almost everywhere anyone has ever tried....if yoiu are looking for a seat that has the best chance of installing well without lockoffs...,the nauti is probably it.....
OP,
Why do you think you need built in lock-offs to install in that seating position?
The seatbelt is forward of the bight, and there are long bucklestalks. The shoulder portion comes out of the top of the seat in that location, and I find it very hard to get it to retract fully. There may be something wrong with the automatic locking mechanism because it always comes slightly loose, no matter what I try. I can install a seat and have in in rock solid. Within a few days, it is loose. I can tighten everything up again, and then in a few days it is loose. It is not crazy loose, but it does make for close to 1 inch in movement. Since I've put a TF there and used the lock-offs, the seat has stayed solid. After a few days, there is slight slack in the belt, but it is from shoulder portion so it doesn't affect the seat install, KWIM? I could just use a locking clip to keep the belt tight, but with the buckle stalks the way they are, there is no room for me to get a clip on - even after rotating the buckle stalk 3 full turns, the clip falls right on the edge of the belt path. If I rotate any less, then the buckle stalk is in the path.