Represent! I hate f-in' mice, they give me the creeps. The following isn't specifically about mice in trucks, just about mice in general:
Never even saw a mouse till we moved up to the Wht Mts. Like K, I tried everything to keep them away but they just didn't care. So I figured I would just kill them all. I know you can't really get them all, but it feels good to kill a lot of them. Here's the best trap I have ever used. You wind it up, bait it with some peanut butter and it does the rest:
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It is made by Eaton and sells for about $20. While marketed as a humane/catch & release device, it really isn't. It will trap up to 15 and flip them into the holding cell. I don't know if you've ever seen what happens when two or more mice get trapped in a confined space, but it is brutal. Within a few minutes they resort to cannibalism. So if you don't empty them out immediately, one will start to devour the other. If you come and check it two days later, the holding cell will contain just one live mouse and the bones/guts of all the others.
Don't clean it out too good. An exterminator friend of mine says to leave it as "mousy smelling" as you can.
Epilogue:
Finally, I couldn't take it anymore. Between my wife's blood curdling shrieks and the scratching sounds in the walls at night, it was too much. So this summer I paid a guy $850 to get rid of the flying squirrels (oh yeah, we had them too) and mouse-proof the house. Money well spent. Haven't seen a single critter since - fingers crossed.