PosteritatiAccording to the U.S. Department of Transportation, via this New York Times story about today's cash-for-clunkers deadline, I'm the proud owner of one of the most popular trade-ins: a Jeep Cherokee, which is starting to drive like today's its expiration date as well. So, how'd it go for locals? The Times kicked the tires with a couple of Dallas dealerships:The most popular trade-ins include Ford Explorers, Ford F150 trucks, Jeep Cherokees, Chevrolet Blazers and Dodge Caravans, acco