In tower cranes counterweights are placed on the counter jib to prevent the crane from falling over. Whereas on mobile cranes the counterweights are placed directly behind the cabin. The crane in itself also acts as some counterweight. My question to you is: How much weight can an object support on one side, without using counterweights, before falling over? E.G. a 40 cm arm with an 8 Kg weight is added to a 20 Kg box. Will the box support the weight without tipping to the weighted side?