cnn.com:

Despite the government’s top-ten Cash for Clunkers sales list’s exclusion of large trucks, two full-size trucks were actually among the top-ten buys and a small crossover SUV, not a compact car, was the most popular overall.
An independent analysis by Edmunds.com using traditional sales measurements, tallying sales by make and model, disputed the government’s results which showed small cars as the top choice for shoppers looking for Clunker deals.
For example, the Ford Escape crossover SUV, instead of being the seventh-most popular vehicle under the program, as the government ranked it, was actually the best seller, according to Edmunds.com.