The shocks/suspension will go out FAST in the third and fourth pictures (hell, the 3rd guy will loose the entire back of his car). First guy will hit a lot of air resistance, and probably loose most of that stuff. The second one will probably loose it too. All in all these pictures are decently funny.
The car in the first picture might have made it through without many problems, but all of the others have a lot of weight on their back wheels,axles,suspensions, and tires. The third car almost looks like there is no weight on the front wheels. It lines up with my theory...(helps prove it actually)