Evidence will be in the form of your licence to a degree. Ok you can have the classification on the licence but still not have driven, yet as most employers will more than likely insist on a letter from your current employer and that would more than likely mean you are currently employed by a haulage firm.
Yes there is a chance you haven't driven for a number of years but still hold the licence, but i would imagine questions, or at the worst a driving assessment would be required to prove that you are still capable.
Kim