Man I got thinking about this, if I can find a buyer within somewhat reasonable range there could potentially be a huge market for this with great profit margins. I'm sure tire shops would let you take all their junk tires, they are charging $2-5 each for disposal on them, they should be more than happy to give the tires away. If I had large sides on my gooseneck I could haul a great amount of tires (once accumulated) to the buyer and probably bank a great profit with only fuel cost and time invested (plus wear and tear on the rig)