Passenger-van safety depends on the group, the loaded vehicle, and the driver working within the same limits. Adding people and luggage changes the weight being carried, while a long body and several seating rows introduce visibility, access, and restraint needs that may be unfamiliar to someone used to a small car.
The useful checks are concrete: every occupant has an appropriate seating and restraint arrangement, the load stays within the vehicle's limits, tires and other equipment are serviceable, and the driver understands the vehicle and route. Electronic assistance supports those decisions; it does not make an unsuitable load or seating arrangement acceptable.