Some of the toy haulers have a dedicated garage but ceiling height is cut down on the forward section to allow a sleeping loft from the "living" side of the RV. This would allow you to haul the bikes and not unload when going to sleep. There is still a dedicated bedroom in the nose for the parents, so everyone has a place.
Most toy haulers allow the couch or dinette to be converted to a bed - This is also an option for the kids. My previous toy hauler had a queen bed for the adults and dual twin beds converted from the dinette and couch for the kids or guests.
