The new 2011 Ford Explorer is still being considered an SUV rather than a crossover despite being built on a unibody and having components in common with the Taurus and Flex. Sitting lower and being wider and longer adds to its inherent stability. The addition of Curve Control built atop AdvanceTrac stability control system completes the safety upgrade.
Background
Ford Explorer had record sales of 445,157 units in 2000
NHTSA safety investigation into Ford Explorer roll-overs began May 2000
NHTSA found certain Firestone tires experienced statistically higher failure rate when installed on Explorers
Blowouts led to an estimated 150 deaths due to crashes and rollovers