Who makes the deepest notch?

[Malibob]

I am not looking for a foot or anything or I would be going to a step notch. The main reason for my query was to see if anyone knew who made the largest one. I know it cant go past 3" but was just curious who got closest to that.

I think once you get to 3" you have to modify the bed, furthermore I think you have to also add support over the frame at that point.

Maybe I should have asked a different way- who else makes a c-notch besides the above mentioned. I am just trying to spend my money wisely (be cheap about it)

How deep is yours? I was actually hoping to see how yours sat with a bed on it.