My first choice would be to store the boat on the wheels and stern chocks. I would be careful about using round fenders under the sterns, they tend to roll out from under the boat.

My second choice is the 4 tires. I have seen it and it looks very reliable. The tires don't fall over, people don't mess with it, and it's recycling.

I remember seeing some stern chocks made from old tires in Virgina or South Carolina. The tires were old ATV or industrial tires cut in half and then the tire cut away to make a flat spot touching the ground. I was never able to track the builder down.