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i looked at the column lifts quite a bit.  most of the older ones are 3 phase so look for that.  the cool newer ones have a battery in each one and an inverter and are wireless between columns. 

my cfo said i could have some but i decided it didnt really make sense.  although sounds fun.  i have used them at a local shop and it is great that you can move them around.

tom

So these are right in the middle. My buddy bought them from a govt auction, they were used for heavy vehicle maintenance and I believe they are either 80k or 100k rated. These are the 24v DC battery operated units but they are not wireless. They have a cord that has to be plugged in from unit to unit to daisy chain them. 
I have come across a lot of free 3 phase equipment over the years at my day job, I know how that can be, you see something that you would love to have but it’s 3 phase. Generally not cost effective to buy a rotary converter unless it’s something you really want. My brothers have a 3 phase milling machine, one day I will get down there and get a VFD put on it so they can use it. Amazing you can buy some fairly inexpensive VFDs now, that is also a good route to convert 3 phase equipment but you have to understand if it’s a motor the life may be shortened by running it on a VFD, depends how hardy the winding are. Anyways I am rambling.