That represents a greater danger in vehicle-vehicle collisions, but I doubt it's anywhere near as a large an effect for vehicle-pedestrian collisions.

It's possible, though, that the larger vehicles represent a greater danger due to poorer visibility. I don't have enough experience driving a contemporary truck or SUV to know the driver's experience, but I do know that, when parked along the street, they present a serious visibility problem for pedestrians compared to coupes and sedans.