VentEnterSearch.com offered up a post on how to organize Cribbing for Vehicle Extraction. Cribbing gets strapped to a base plate, and enables it to be carried as a unit. Properly sized, you could use one pack per side of a car.
Over at AbsoluteRescue.com they featured LA County Station 8 cribbing. They get Extra points for the Magic 8 ball. branding.
Bonus points for someone who suggests a method to pack Step Chocks and Wedges.