I have seen advertised in some horse mags a type of horse shoe that is made of the same type of stuff that roller skate wheels are made of. They cover most of the sole but not all. I think they would be awesome for riding on rocks, especially the large, flat rocks you come across on some trails, and also on pavement. Has anyone on here (especially any farriers) had any experience with these? I know I read somewhere about a group who made a cross country ride (Best of America by Horseback, maybe? they had wagons, too) that learned to use car tire treads on their horses because pavement just ate up the horses shoes in just a few days. They made pads out of the car tire rubber and they lasted much longer than regular shoes. These would be easier than boots with no worry about sizes, etc. Any comments/thoughts?