I assume this is the right forum since most people who want a short, want it for the purpose of staying below a rack?
I made a video for anyone interested.
I think the original file setting is a bit small and the FITS didn't slide in well.
https://www.thingiverse.com/thing:5149146
I increased the Y 118% and the X 101%. Seems to be working well.
I plan to make a camper one way or another. I am thinking of designing something that works with the tailgate down since most of us are taller than 4.5 ft.