M_Boats: toe rail strength

I asked if it was so, But no answer as yet, , a local yard told me that the toe rail on the Monty 17 was strong enough that with four equal points of lifting the toerail could easily hold the boat in the air with out damage. He suggested that the factory may do that to move the boats during construction process, I have never been to the factory so I'm not sure if its correct or not. Now I see a picture on the net where a Monty 15 is being held in the air by that method, what gives, ???