I’m considering putting one of my ivar shelving units on wheels so that I can move it about in my workshop.
So the simplest thing seems to build a platform with wheels, and add some blocks to “lock-in” the uprights. I’m not sure at this stage if these will be wood or metal or a combination.
I’ve sketched this up using 75mm castors, but might use 50mm castors (as I have some!) to create a prototype.
Clearly the unit needs to be stable and secure.