Inconspicuous

Have you noticed that the larger a vehicle is, the more suspicious it looks? Take for example, this car.
Fairly innocent looking. But this one is a different story:
Now we are getting creepy. What cargo could it be holding inside? There are, however, some exceptions to this rule.
Nothing suspicious about this truck at all. So remember kids, if you are trying to smuggle some illegal-type cargo across some country-type border, drive a Dunkin' Donuts-type truck.