How to store car without rodent infestation?

I use peppermint in my trailer through fall and winter.......as ell as bounce sheets. Seems to work fine and smells ok too. In case i also have a trap set with antifreeze in a bucket with a coat hanger through a coke can smeared in peanut butter with a ramp going up to the top of the bucket.I have only caught a couple in the last few years.It works and it dosent stink...............Just some thoughts.