I've had excellent luck with my vehicle, although that was usually in an unintentional slaying. I haven't personally had to intentionally trap/kill one. The only reference I've come across was in the book Alas, Babylon. The character has a Dachsund which instinctively goes after an armadillo in its' burrow. The armadillo and dog make quite a ruckus underground, and the critter quickly emerges. The character is there to dispatch said varmint. Don't know how helpful this is.
On a possibly related note, there is a......"method".....for dealing with underground varmints. I've only heard of it being used for moles/voles. The old farmer I knew told me he would stick a hose into their tunnels. That hose was hooked to his acetylene tank. He would turn it on, and since acetylene is heavier than air, it would travel through the tunnels and displace any air. After he was satisfied that enough acetylene had filled the catacombs, he would remove the tank and drop his lit cigarette into the hole. He stated that there was a muffled BOOM, and the ground would raise and sink about 4 inches. He told me that it never failed to end his critter problem.
That being said, I don't know that is the safest "method". I'd be quite worried about root fires, proximity to gas lines, etc. He may have also been pulling my leg. Just thought that any suggestions might help you in this situation.