Although the huge size and weight of semi trucks make them seem indestructible, you would be surprised at how easily they can lose control. Large semi trucks were built to haul lots of cargo rather than for a stable ride. Its high center of gravity and its long length make it vulnerable to jackknifing on slippery roads and to rollovers. Unlike jackknifing, rollovers can happen on a perfectly dry pavement. This uncommon but deadly truck accident is often caused by misjudgment and negligence on the part of truck drivers. Here.