Toyota reported first quarter operating profit that beat analyst expectations, boosted by strong SUV sales in the U.S. The automaker follows the likes of General Motors, Ford, Chrysler and BMW in reporting strong numbers on SUVs. Michelle Krebs, senior analyst at AutoTrader, breaks down what's driving the trend in SUV sales, from low gas prices to affordable interest rates, discounts and incentives. Krebs says she anticipates this trend to continue, but to largely stem from crossover SUVs. According to Krebs, automakers' smaller, lighter SUVs will continue to be their hot sellers going forward.