Gas-guzzling SUVs and light trucks become an obstacle for marketers

It's the ultimate marketing challenge: Persuading people to buy something that they don't seem to want anymore. These days, that something would be gas guzzlers. Sales of light trucks declined 28% in June from the same period last year, according to Autodata Corp. With dealers stuck with tens of thousands of big vehicles on their lots, the automakers' advertising agencies are under pressure to come up with a way to move them.