Kelley Mascher writes:

Along those same lines... take some lumber along for bridging. If you
have to move the mill on the hook very far, bridge the legs with the
lumber and lower the mill on to the lumber.

May I suggest using 10' lengths of SuperStrut clamped on in that fashion,
if you have the room to manuever. That way you also have "outriggers" that
protect against tipping your improvised platform truck. Available at Home
Depot or Lowes.