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.
“Enter the name, length, width, height, and the quantity of vehicles of a particular type that should be added to the project.”
https://www.goodloading.com/en/manual/adding-a-vehicle/adding-a-vehicle/
“part.length | number | Yes | Length of the loading space part. Must be greater than 0.”
https://www.goodloading.com/en/api/documentation/api-data-description/
Vehicle, sea container, air container and pallet spaces, from a preset list or typed dimensions (API type vehicle/sea/air x/air y/pallet). Rail wagons are only claimed on a Polish-language page (up to 99 load spaces per project, no rail-specific rules; manual check #1). Freemium restricts custom load dimensions; whether custom space dimensions are also PRO-only is not stated (a Q3 2024 note mentions editing space dimensions in freemium).