I made a heavy cart about 18" wide and 4' long,heavy angle iron. It has a bottom shelf I keep full of heavy stuff. In the center,I welded a 2" square steel bar about 8" high. Milled dovetails into the top area,and slipped a 500# capacity Sky Hook over the dovetails.
I mean to mount my lathe chucks on the top surface.
The cart is on heavy duty casters. I can roll it up to the mill,and lift things onto its table. On the lathe,I can mount the Sky Hook on the toolpost,and lift chucks from the cart onto the lathe. It is easy to manipulate the heaviest chucks by small increments to line up with the D6 spindle.
I made the first cart for my former job. We had a large Promaster lathe. My partner Jon,and I built 2 more carts for our home shops. The Skyhook is a handy little crane.
I also have one of those battery powered lifts that will lift 1500# if the going gets too tough.