Red clay and chert, have prevented me from digging them up with a pair of post hole diggers to many times! I had some traps in St. Clair County I actually hooked a chain to the d-ring, hook it to the bumper and pulled out- with Toyota 4x4. grin I drove the fox hollows down 12 inchs in wet clay, and 1 week latter when I moved my line, it took 4x4 to pull up the Fox Hollow bullets !!!