Plow shoes are a joke! They don't help on gravel unless it is frozen and if it IS then you don't need shoes. I never figured the shoes were there to support the plow anyhow but to help cut down on wear on the cutting edge.
I use them for door stops and wheel chocks.I think they would make a good anchor for a small boat too.If you have a Fisher plow,and trip the edge real hard,the bottom of the shoes will dent the backside of the moldboard big time,they will put a dent in them about 2-3" deep,just one more reason to take them off,especially if you have Fishers like I do.
I use them to introduce people to welding. I clamp the shoes in a vice, bring out the 7024 rod and the auto helmet and tell the novice to stop when it is built up 1/2". Then we throw them in the pile with the rest of the shoes, and have a beer.