The slabs have a weight that is close to real, and therefore not every truck crane lifts a ten-meter slab from the FS 20 farm. In any case, I recommend using a truck crane to load the slabs.
The pack of slabs has four options: seven-meter, four-meter, ten-meter, road block.
I made a pack of four slabs for Farming Simulator 20 Mods. These are JBI Plity models.