Grandpa's cheap, auto resetting trap
1)obtain 5 gal bucket
2) drill holes (1/4"-1/2") opposite each other about 3" below the top lip
3) drill holes (1/4"-1/2") through the lid and bottom of a 20 oz. soda bottle
3) run 1/4"-1/2" dowel through one side of the bucket, through the soda bottle, and then through the other side, so the soda bottle is suspended between the sides of the bucket.
4) coat soda bottle with PB, honey, or some other type of somewhat sticky substance.
5) give the mice something to climb up the side (piece of rope hanging to the ground over the bucket, etc.)
6) fill the bucket halfway with water, (gpa used antifreeze, but if you've got stray cats you want to keep alive, not a good idea)
Place the bucket under or near the trucks. Mice will attempt to get the tasty treat on the soda bottle, and their weight will cause it to spin, dumping them into the water. Bye bye mr. mouse
I believe it was SilverZuk that did a writeup on this same trap setup on PBB. Its a fairly common farm trap technique.