Rodent nest in truck

If the nest was that big its a rat, and not a mouse. Mouse will make a nest that will fit in the palm of our hand. There so many different kinds. Wood rats hang out in brush piles and firewood stacks, attics and places like that. And they are as big as a squirrel and Ive seen one give my cat a pretty good fight. I have also seen them carry open end wrenches and other shiny objects to there nest, Hence the name pack rat. And they will eat your car up. Ive tried a lot of things, but the most effective thing I tried was Gopher poison if you have a lot of them, I like traps because you catch them and remove them and don't take a chance on him dying where you cant get to him. But if they are really doing damage get you a little metal can like Vienna sausages come in and poke a tiny hole in it and run a wire through the hole where you can fasten it snug to something under the hood. And just add a little gopher poison, not so much it comes out when you hit a bump. A few grains wont kill a dog though anyway. I buy it by the 5 gallon buckets for my gopher plow that I use in my hay meadows. Plow puts it underground but a few times Ive spilled a little and it didn't kill my chickens or anything. I leave the can there permanently so I can just pop the hood and add a little bit occasionally. I have found them laying by the can. It works.