I too have used both wooden and steel dowel rods to move heavy items like gun safes across a flat floor, but they have flat bottoms and lend themselves to that.
My current Logan lathe was delivered by a guy in a drop-door trailer. When we got it down the ramp and onto the floor, I left it jacked up when he removed his piano dollies. I then ran to Lowes and bought 4 casters and fitted those. They are only rated for 500#, but I only need to move it once a year to sweep behind and check wiring. They'll do fine with that kind of light duty.