I was almost swamped yesterday in flooded streets (Houston)from Erin. My Tahoe was not having any trouble except for the little tiny cars that should have been left at home. I no longer have kids at home to haul around but I drive a Tahoe because our streets flood, they always have, they always will. Last year I had plywood cut to fit all our windows.
Sounds like you are quite prepared. Cutting plywood for the windows is a miserably labor intensive chore, with hanging them a close second.