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We are looking at a 1994 GMC 15 passenger van. Since the seat backs are low, I intend to use high back boosters for my oldest children (age 7 and 9). My youngest 2 are still in 5 pt harnesses. My question is at what point can my 9 year old sit without a HBB? Should I keep him in it longer than I would in our Ford Windstar because of the low seat back, or still follow the 5 step rules? I was intending on keeping him in a booster (low back) in our Windstar until he was 4'9" - he probably fits 4 of the rules now, but not sure he would sit still without the seat's "boundaries"