A trailerable cruiser can work with a large family especially if you have a full camper that allows for another "sleeping room" on the deck. If you can camp you can sleep on the deck of a cruiser with a full top. I would however suggest you look at a boat with twins. you can find single engine models in the trailerable range but with a large family and all of the gear a twin engine boat may be the best way to go. Good luck.