It's a well know fact that conservatives hate the Earth. They express their rage towards the planet in many ways--shooting animals, digging for coal and oil relentlessly, burning coal and oil like it's going out of style, and driving gigantic SUVs. Conservatives will use SUVs to waste natural resources for fun, and run over small minority children and small animals. It's a part of their culture.
Just like an "Obama" bumper sticker on a Toyota Prius or Volkswagen, you're sure to find a host of Conservative statements on a SUV. Many stickers may read, "NoBama," or "I'll keep my guns, freedom, and money, you can keep the change." But the most common motif is of course "God Bless America." More trendy stickers may read "Don't Tread on Me" or "Palin Power." In conservatism, driving a SUV is more than just a necessity, it's somewhat of a status symbol. The entry level conservative may drive something like a Ford Escape, more advanced conservatives will drive Land Rovers, but for seasoned expert conservatives, there is the Chevy Tahoe and Hummer. Nothing says, "I'm a complete Asshole," more. Conservatives will wear it like a badge of honor.
Another reason for flaunting over sized vehicles is to compensate for small dicks, for the conservative ladies it's because of penis envy. A conservative (which is typically some over confident, Type-A, sociopath) will often have problems dealing with their size, and run out to buy the largest most elaborate vehicle they can get their hands on. Once inside, the conservative is at ease and proceeds through life in their ultimate road rage machine. Nothing will stand in their way.
