Everything depends where you live buddy. If you live in The United States, you do not have to be worry. No policeman can search your car without your permission even if they stop you for a minor offense. Only what you have to do is just say that you are not giving consent for a search and that you are going remain to be silent. All they can do is just check your Driver License and write a ticket. As long as you did not commit a serious crime, make note that traffic violations, expired registration etc. are not serious crimes, ans as the result do not give permission for law enforcements to search the car.
However, this is how it is in U.S where exist first and fourth amendments that protect people. In other countries I would be much more worried driving around with my gear.
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