My Granddad swore that by attaching a potato sack to the wheel the dog could catch the car (drive slowly). Then the sack would give the dog a good flip when he bit it and thereby "break him" of chasing cars. Only thing it did was kill one dog - broke his neck.
I agree with Spaw - it's a crap shoot as to whether or not the dog will quit once it has started. I tried an electric collar - even got up on the roof of the house so the dog didn't know where I was. All it did was reinforce the idea that the car/truck was part of the problem and needed chased off "his" territory.

I'd certainly endorse professional training assistance to alleviate the problem.

Good luck!!

Steve