I have extraordinarily rocky soil. Trying to dig down 18" or even a foot to put protective fencing for a run in is going to be next to impossible without renting a small backhoe, and then I'll probably break it! Is there any other way of protecting them in a run? Can you lay the wire down and hen cover it over with bedding/sand/whatever, so the only digging required is for the fence posts? This is the only thing that's keeping me from starting to build my coop. Any help would be greatly appreciated.