LAS VEGAS -- One day after the NASCAR stop at Phoenix, Kevin and DeLana Harvick got an up-close look at NHRA drag racing, standing behind Bob Vandergriff's Top Fuel dragster in Las Vegas.They could be permanent fixtures on the circuit at some point.The Kevin Harvick Inc. owners are looking at possibly joining Vandergriff's self-owned, UPS-sponsored operation and starting a second Top Fuel car under the KHI name."We're just exploring the options to see where we could go with Bob, to give our sponsors on the NASCAR side some other looks at different markets," Kevin Harvick said.KHI fields a Nationwide car and two Craftsman trucks, and while testing a few years ago at Valdosta, Ga., the Harvicks struck up a chat with Vandergriff about the straight-line world."It's a totally different draw -- the power and speed and everything is here," Harvick said. "Ours is more about 500 miles of racing. It's a very different environment than what we're used to, but we're all racers, we like to be involved in racing."The involvement will go only so far, however. The NHRA has its share of women behind the wheel, but Kevin Harvick said DeLana won't be another."It was all I could do to pull her up to the starting line," he said. "She was scared to death."