Why the crate holds the object in space
The instinct with heavy freight is to build something stronger. The correct move is usually to build something that isolates. A heavy skid base carries the mass; the enclosure keeps the object located and protected but carries no product load at all.
Anything braced to a crate wall receives whatever shock the wall receives in transit, which is precisely how a strong crate delivers a cracked casting. Everything that mattered on this build was braced back to the skid.
