I like putting weight(rocks or boxes) in my bus/car and climb mountains. however the items i put in the car can sometimes touch the wheels or when i brake they clip through seats and come front and you can see the said items from the bottom of the car. Itd be nice if the seats and floor were solid so items would stay in their intended places. (also a way to "glue" items in the car would be super cool)
Put the rocks where you want them to be on the car, hold left Ctrl so blue dots will appear. Click onto one of the dots on the rocks & drag your mouse while holding the left mouse button to another dot on the car; that should "weld" them. By using the scroll wheel, you can adjust the strength of the link between those two entities
