He was thrilled with the used truck he had just bought. The lift kit, the big-beefy tires: it was a monster rolling down the highway. And, when he took it off road, as he planned to do this coming weekend, he expected it to take the roughest terrain in stride. While imagining the truck clawing through mud and over hills, he hit a minor bump on the highway. Though he revved the engine, the truck just slowly rolled to a stop.