A point with radials ....if the base doesnt sit flat on a solid floor ,they will get up a chatter as the base flexes.This is completely aside from the safety aspect of making the machine tip over proof.....And never try to slide a machine on a rental alloy floored truck ...it do massive damage to the tray. ....Sliding with lube would be risky ,because the lube is still there when you hit the first corner ,or brake......Bad enough just the assorted slimy grunge that gets on machine bases......Seen 8 ton machines slide away on forklift tines ...cast iron on steel with a little lube is deadly ,believe me....Ive been doing this kind of stuff for near 60 years ,and got smashed up once ...which is more than enough.