This picture is from a post from The Atlantic. It is of a couple from Brooklyn, NY who converted the back of their truck into a movable garden.
This story hits home for me after my trek up to Lansing. I almost got killed by an aggressive, large pick up truck driving maniac on route to check out the Food Ways exhibit. Me in my Prius and him in his, I am not sure the make, huge pick up truck. I could not help noticed that the bed of his four door, low gas milage, vehicle was empty.
In fact most pick up truck I see have empty beds, and are probably not really used to carry anything more then the person driving it. I say if they are only driving a truck to puff up their peacock feathers in a fashion display to impress the opposite sex, then why not at least get some good use out of it and plant a garden in back.