Use manufactured wheel chocks or wood blocks at least four inches in height. Do not use wedges or 2 x 4s because they don’t create enough resistance for vehicles with larger tires.

The university said its testing shows these chocks will last at least a decade, which UD estimates will save the Air Force $6.8 million in that time, compared to having to replace wood or plastic ...

Wheel chocks work by being snugged up against tires to prevent them — and the aircraft — from moving. Legacy chocks made of wood sometimes fail for a variety of reasons, Troidl said. "Wood by nature ...