Defendants' gasoline trailer breaks away from the truck towing it, leaves the highway, and falls onto a road below. Thousands of gallons of gasoline spill onto the road, and a motorist driving across the road is killed when the gas explodes and his car is engulfed in flames. Plaintiff brings a wrongful- death action against Defendants, one of whom is the owner of the truck and the other of whom is the driver. Should strict liability or product liability be imposed? If so, why?