I live in central Minnesota and bale graze with great results. However one problem is the piles sometimes left of bales in our hayfields. Depending on the weather and other issues some are cleaned up well and some aren't. I have used both spike and spring tooth drags with limited success, mostly the drag slides over the hay. I read about drags made of old tires that do a good job of dragging the hay apart. I have a friend in the road and gravel business who has a lot of grader and truck tires to get rid of. Has anyone used a tire drag for this purpose? Which tires do you think would work better? Plans? Sites? Thanks.