If your car is worth a lot of money and you really want the best have a look at these.
http://www.carcoon.com.au/index.html
What would be good if you could get one that was powered by solar keeping the air flow during the day.
Just keep some food for the rats near by so they don't eat it, like Ratsac
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Pricing is not so bad
http://www.carcoon.com.au/catalog/pr...products_id=12
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