While the plywood and 2x4s are fairly obvious, what you can't see is the back seat, which contains 10 bags of concrete at 80 lbs. each. They estimated the load weight at 3000 lbs. Both back tires exploded, the wheels bent and the back shocks were driven through the floorboard. The car, with Florida plates, was headed for Clanton, AL where the couple presumably planned to build a new house.
And these photos also give us some more insights on this phenomenon (thanks again, Anthony :>):