My utility trailer in the driveway is chocked with my home made 4x4 chocks as I type... I also have used EVERYTHING to chock em with.
The secret to chocking is to put something the tire must climb to get over... not simply PUSH it along in front as it moves. A 1x4 which is 3/4 inch tall works far better than a 4x4 which will scoot in front of the tire.
Big JIm <img src="/forums/images/graemlins/pfft.gif" alt="" />

professional bovine relocation specialist