Rule #1: make haste slowly. Think things through completely. Stop and reconnoiter immediately if there's any sign of a problem.
The lathe, and likely the mill, are going to have a relatively high center of gravity.
If you can arrange a hoist, that may be the easy way to load. Lift the lathe through the center of the bed -- put crossbars under the bed, straps down through the bed, and lift on those. If you have to go up a ramp...see rule #1.
Try to make a living, not a killing. -- Utah Phillips
Don't believe everything you know. -- Bumper sticker
Everybody is ignorant, only on different subjects. -- Will Rogers
Law of Logical Argument - Anything is possible if you don't know what you are talking about.