Jake B
Most places that sell tires have plenty of old ones. Perhaps your not near any place such as that but they will give them to you in most cases. If you do use tires and you band them togeather in the upright postion be sure to drill holes in the top to get rid of the air so they will sink. Someone else will have to advise about pine trees, I would not think some would hurt, a few per acre perhaps.
Big Jake
