This cannot be done from the equipment side (this mod).
This needs to be done from the vehicle side, adding equipment_categories to their vehicle grid.
Panzer IV is a medium tank (just determining from its name, assuming it is that historical tank), so should use at least equipment_categories = {"armor", "vehicle", "tank", "tank-M"} in order to support equipment of my mod set (and also some relevant equipment mods from others.)
So please send your request to mods that you think relevant.
Note:
For light tank, please remove "tank-M" from the above-stated property.
For heavy tanks (e.g., Tiger), please also add "tank-H" to the above-stated property.
For super-heavy tanks (e.g., Maus), should add both "tank-H" and "tank-SH".
