about to transport

[Toolmaker51]

Lashed together or not, my first concern is side and concentrated loads on the frames. These will multiply in turns, bumps and rigidity of the trailer or truck frame. Rarely anything, usually nothing 'locks' a surface plate to it's platform.
I'd arrange a suitable capacity forklift [weight + load's center of gravity] and some timber cribbing. Load the platforms on top, set on carpet scraps.
I won't call myself an expert, but studied what and how for just under 200,000 pounds from Los Angeles to the Midwest. Riggers did all the work; after I was convinced by one of 3 bidders.
All said and done, if possible arrange for machinery movers. They'll show up with lifts, flat bed/ lowboy and all dunnage needed. Not to mention insurance.
I had a large [read green one in the avatar] lathe moved 100 miles for $350. They were done in two hours. Certainly wouldn't been able to even rent all the gear for that.
I make these recommendations based on simple facts. A damaged frame has little value but scrap, or hangs up installation. A broken surface plate has no value at all...