Truckasaurus Rex
Truckasaurus Rex
They were big moneymakers in their day, but full-size SUVs on pickup truck chassis can't compete on maneuverability or fuel economy. More flexible crossovers have rendered truck-based SUVs mostly obsolete, and expensive hybrid-powered versions have flopped in the marketplace. Both the Chevy Tahoe and GMC Yukon are due for an update in a couple of years, but don't expect to see them remain in GM's lineup for long.

Last updated August 26 2011: 9:52 AM ET
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