This is to wall mount a Tricam step stool. Our unit isn't labeled but I'm guessing it is model TR-2W-HB from looking online.
The step stool is made of 1" steel tubing and is 18" wide with a 4" radius bend. As long as the radius is 4", this model may wall mount other similar step stools with no modification.
What's nice about this design:
As is, the model is designed to use GRK 2-½" cabinet screws (washer style) so that they protrude ~¾" out the back to sink straight into wood.
I include STEP and Fusion360 files so you can modify. Print on the (inner) sides for strength.
The author marked this model as their own original creation.