Lots of wood blocks as
@pontiac428 mentions above.
6x6's, 2x6's 2x4's, some 3/4" plywood comes in handy also.
(1) Post Hole Digger and Tamping Bar (shown below)
I use one to move all my machines, from the Bridgeport, the Index to the Drill Press. Low cost 'Johnson' bar.
(Also it looks like there are two large holes in the base of the mill about 12" up. Wonder if a large pipe would fit thru them.)
Taking it one end at time, slow and easy.
Support it in the middle front with 2x6's getting the corners up, and leaving the back side resting securely on the pallet.
Cut away the pallet under the corners for a couple of 6x6's. Lower front onto the 6x6's, nice and firmly rested.
Repeat at the rear.
Then incrementally lower each end no more than 1" or so. I use a lot of 3/4" plywood cutoffs.
Get it down on pipe on the floor and scoot into position.
It's time consuming but it works.