trailer jack wheel fold down foot?

[NathanatFork]

I recently saw a boat that had a neat feature that I would like to add to my boat. He had a fold down foot on his jack stand. You could have it folded up and the jack would set on the wheel, or you could fold it down and it went down underneath the wheel and provided a flat foot under the wheel so that it would not roll. Does anyone know what this item is called and where to get one? Ive had my boat roll on me a few times when disconnecting from the trailer and would really like to add this.

[Tritonbmc]

That's a great idea. I'll do some checking, and maybe someone on here knows who has them.