[Wenin]

http://se4modding.spaceempires.net/M...html#Chapter16

Cargo Storage
Value1 = Number of cargo spaces generated.
Value2 =
Valid in Components.txt, Facility.txt, VehicleSize.txt

This vehicle can store units with a combined total mass less than or equal to Value1. Multiple components with this ability form one continuous cargo bay, so two components can hold a unit bigger than any one individual component could.

That should be updated with StellarAbilityTypes.txt or did you mean by it being added after map generation?