Other than the suspension components, what are the other differences in truck ratings from F150- F250- F350; Chevrolet uses 1500, 2500 3500 ratings. Chrysler uses similar badges.
Not sure about California specific but once you get into commercial transport, it's a different ballgame and most states require a chauffeurs license regardless of size.
Ignoring the legal stuff, moving 10 kids, a 150 should be fine.
Also for clarity, Ford uses E150-350 designation for vans and F150-350 for pickups. Otherwise the answers should be pretty similar.