I wish I could do pictures.
For years, I had plain old tread-plate aluminum running-boards, mounted in the intended position and with the intended bracketry.
They were good at keeping rocks from slinging up the side of the truck, but next to useless as a cab-entry assist.
They were too far up under the rockers and somewhat flimsy, giving the feeling that one could ride them to the ground; they never actually gave loose, they just always felt like they could.
Then, I built myself a set of REAL BRACKETS (3/16 X 2 angle-iron) and moved the entire set-up outward at least four inches.
I bolted through the inside of the rockers and then drilled down completely through the door-sills and used big fender-washers and all-thread that catches my brackets just behind the vertical backing of the running-board.
The boards themselves are bolted on top of the brackets.
Now, I actually use the boards when climbing in the cab; the wife loves them; and, they are solid as a rock.
I have stainless grab-irons bolted through the pillar just behind the doors.
I have grab-irons about half-built that will go inside the cab, but they may not get finished for years; that's just the way projects go when one is inundated with them.