I'm working on a personal mod regarding concrete. When I looked up Concrete Building Materials in the n the SBC file for this mod, the weight of one unit of concrete building materials is 2,000 kg, but the volume is one liter. Whiskey, Tango Foxtrot? That's the same density as gold or plutonium. No wonder my truck broke!

The density of concrete is 2.5 kg per liter/2,500 kg/m3. Load up a Eurospec pallet with concrete, that's 1,500 kg and 600 liters/0.6 cubic meters. That roughly checks with the IRL dimensions of a pallet of solid concrete pavers.

Clay bricks come in at (call it) 2000 kg/m3, so 1,200 kg and 600 l per unit.

For my mod, I am going to (Lord help me) go into Blender and try to make custom models for a pallet of concrete pavers and a pallet of bricks. Straight up 1 m x 1 m x 0.6 m tall cube, so even I should be able to figure it out. If I succeed, am willing to share those.