GMC Envoy XUVThe SUV exploded in popularity throughout the '90s to become the de facto family car of the new millennium. To keep an edge over the competition, automakers pushed the boundaries of what the SUV could or should be. Sometimes they pushed too far. The GMC Envoy was a popular model in the medium size range that could be had with room for up to seven passengers and powered comfortably by a large V8 engine. However, not content with mediocrity, GMC stretched the Envoy to offer an XL model.For the XUV, engineers removed the completely useful third-row passenger seat and replaced it with a washable, flat floor similar to that in a truck bed. The rear door could open down like a tailgate but was also hinged at the side to open like a door, much like station wagons of the '80s. To make it as strange as possible, the roof of the cargo area could retract, leaving an open canopy over what was essentially a truck bed with side walls. This made the XUV less practical for passengers and only marginally useful as a truck, and it only lasted for two years.