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If you have a truck with a hitch receiver on the back, then this special safe, called the Hitch Safe, might be something you can use. Some people put magnetic boxes under their car with a spare key in case they forget theirs. This is safer because it is better hidden, won`t fall off and has a access code to get in. I don`t think anyone looking to steal your truck would think to look in the hitch for a spare key. This is $70, but I think it is a great idea if you want to stash a key and whatever else in there for safe keeping.
Image Source: http://www.ohgizmo.com/2009/09/04/hitch-safe-is-a-better-place-to-hide-your-keys/