The user can define a loading space by its internal length, width and height, and the planner keeps all cargo inside it.
Counts when: Documentation shows a loading space with user-entered or preset internal length, width and height that the planner packs within.
“These values represent the inside (loadable) dimensions of the vehicle.”
https://topseng.com/Documents/Software/MaxLoad%204.0%20User%20Guide.pdf#page=78
“In effect, MaxLoad Pro uses this information to build invisible “walls” representing the absolute parameters of the mixed-pallet load.”
https://topseng.com/Documents/Software/MaxLoad%204.0%20User%20Guide.pdf#page=118
Per vehicle record; English or metric. The vendor states there is no fit tolerance: an item that exceeds the space by any amount is not placed (PDF p. 47).