Most cars I've owned, the seatbelt plugs in the back seats are secured in place either by a plastic tube holding the plug in place or just bolted in directly flush with the back seats.
I have 3 kids that I have to fit in the back of my SF5, 2 with booster seats and one in the middle with a car seat facing forward. It's a little cramped. My 2 oldest boys can put their own seatbelts on, but not with how cramped it is in between their boosters and the car seat in the middle.
I know they would be able to do it on their own if they could do it one handed with a stationary-ish seatbelt plug in the back.
Does anybody know of a good aftermarket product that could help with this? What would it even be called?
TIA