Today all four of my truck tires got slashed as well as 4 other trucks at the Tonto National Forest parking area at the north end of 136th St. near north Scottsdale. I think the area is also known as Granit Mountain. Had a nice day of riding only to come back to my truck to find the tires flat and slashed. It must have been done sometime between 12:30 and 3:45. Needless to say we were all very pissed and it created quite a problem and expense getting our trucks towed out. Something makes me think it was a resident that lives somewhere along 136th street the doesn't like the traffic going up there. They also put a "private drive" sign up about 1/4 mile before the area and it is a public dirt road.