Glad I found this! I am becoming an expert on this van.
I've gotten some feedback before, though limited as the vehicle is new. I am wondering what's best for baby when he outgrows bucket (And I plan to ERF). The limitation? It must fit on that 8th seat RF and FF with no issues AND outboard middle row (which should be easy). He could end up in either of these locations. Beside him will be the Advocate with side wings, either RF or FF. So even on wide mode space is an issue. I will use latch RF but for FF I will have to do seatbelt as child will likely be 40 lbs.
I'd LIKE to go with a Boulevard. Maybe Marathon? But my big thing is head protection.

In the future when baby is FF I plan to stick a Radian in the 8th seat as it's narrow and easy to climb into. The big question...does a seatbelt install work there? I am thinking no but I have no idea. I wouldn't really want to trust SL if I had that anyway.
I've got a Radian FF Radian seatbelt install outboard 3rd row. Did you get a solid install? Whew! I did the recline mode, by the way.
I'm going to put the Frontier 85 there (longbelt) eventually.
The kids are growing so fast I have to keep up with our seating arrangements, etc