Nissan Frontier tops latest round of IIHS crash tests, Chevrolet Colorado hits bottom

First time Institute rates small pickups for rollover protection; only one model rates good in test that assures strength of roofThe Nissan Frontier has the strongest roof and the Chevrolet Colorado the weakest among 5 small pickup trucks, all 2010 models, that recently were tested for rollover protection by the Insurance Institute for Highway Safety. The Frontier, also sold as the Suzuki Equator