I'm not sure what the inside of a car carrier looks like, but I think the idea isn't just that a little jiggle that causes the suspension to flex slightly is th

I'm not sure what the inside of a car carrier looks like, but I think the idea isn't just that a little jiggle that causes the suspension to flex slightly is the concern but rather a car coming loose and falling on another car, or something similarly serious and unplanned that isn't supposed to happen if everyone is doing their job correctly. If it does happen you wouldn't want it to be a risk to the whole ship. There's also the possibility that a battery just catches on fire all by itself because of a manufacturing defect. It can happen.