Reply by Gregn

On my table saw cabinet I have 4 locking casters. I can’t tell you how many times I’ve gone to move the saw only to find out that I only had locked 2 of them when unlocking them. My bench top planer stand only has 2 locking casters. So I have come to the conclusion in my shop that 2 are all that’s necessary unless a particular tool proves otherwise and calls for 4. I do make sure that they all swivel though for ease of mobility.

-- I don't make mistakes, I have great learning lessons, Greg