Further to what Chris says when palletising, or otherwise moving, a milling machine I consider it essential to provide solid supports between the ends of the table and the pallet.
Basically crank the knee up to the top, or close to it, of its travel, insert supports and crank the knee down to rest securely on them without attempting to actually lift the machine. Screw or nail the bottom end of the supports to the pallet and run a strap or similar round the top and the table. This effectively converts the lower half(ish) of the machine to a wide structural box making it very hard to topple as the centre of gravity will be somewhat below the table.
No risk of damage to the ways as, properly done, its a stable box so nothing moves independently to generate forces.
When I bought my Bridgeport home, albeit on a trailer rather than a pallet, I used supports of vaguely box construction made from 2″ square timber with chipboard paneling. Rode like Rock Steady Eddie. Timber floor top the trailer so I screwed the supports down. 20/20 hindsight says we’d have made the job even easier if we’d had a pallet to pit it on first.
Clive