North Carolina, a tobacco producer, was/is a low-cig-tax state relative to the north, so we spawned many, many smugglers. Decades ago, they caught a 18-wheeler with what appeared to be a load of milled lumber on it. The ends of the big, rectangular units of lumber were really doors with blocks glued on to look like the ends of the boards.
<added>
They caught him because the weigh-station was open and the officer knew the truck was too light for the load it had.