As much as I hate to say it, in this instance, google really is your friend.
The moving speed bumps are fast, powerful, and ridiculously destructive. They are extremely nimble for looking so awkward. The things are also blind as a bat. Baiting doesn't work, but fences set up to steer them does wonders. A friend put up sheets of plywood and they followed along it right into a havaheart trap. The next morning, his square trap was round in shape from all the thrashing around. He got there just in time before it could escape. He has since started making his own traps out of heavier duty material.
I've heard of people putting fish seines down on their yards, also, to ensnare them when they start digging. Not really sure of the feasibility of that or how well it worked.
Shooting is definitely a sketchy proposition with a pellet gun. My thoughts would be to aim down the neck on a quartering toward profile. Might prevent some ricochets and a better possibility of hitting the vitals.