I definitely would not alert anyone of the possibility of your taking matters into your own hands...tires, etc.
Are these fellows predictable? If so, just be where you can physically take the pictures yourself. Then you have the evidence you need for LE. Of course the owner (you I hope) has to be willing to press charges. Officers detest, and I don't blame them, just running people off. If they spend their time they want to make the trespassers pay...literally.
By the way, If the local CO doesn't want to pay you any mind I'd write three letters, 1 each to my state rep, agency director, and the board or Commission member who represents your area. Agencies get so few letters they pay attention.