So many great suggestions here!! I think
@Old Goat takes the cake for rodent infestations.
I thought I had it bad.
@Cubey the traps still work, but they have gotten smarter around them. You have to change.
Run the traps perpendicular to the path of travel. Always put at least 2 together. Maybe even a glue trap in between.
Use a file or pliers or knife to make every trap a “hair trigger”
Try putting the peanut butter on the bottom of the mechanism so they have to change their approach.
The hood up does work, even on a van. Throw an LED light (5000k light temp) on the back of the intake hooked to a Christmas photo eye, or simply use a switch or hook it to the battery.
And if you see them in the daylight, in the open, you can usually get them with your favorite piece of “humane” firewood. Killed plenty that way!
The traps are reusable, and for heavens sake, don’t throw the dead mice in the trash!!! Predatory birds can see them from way up in the sky. Feed those birds and now you have a helping hand. I have yet to see a dead rodent last more than 24 hours before something else ate it!!
I think Lucy needs a pet cat for a friend!!
Good luck!!
I just bought a Payday as mentioned earlier and am currently trying peppermint oil as well.
The only method I haven’t seen mentioned here is try a water trap under the van to drown them!