Truck Mounted Crane On Back / Rear

Dear ,
I want you to call that supplier and let him to give final price of this attached chinese truck after making or providing rear controller seat up plus provide Grap equipment for lifting concrete block from ground to 14Mtrs high like attached old truck.
Plus how many years can give me warranty for their engine & gear box spare parts because this engine not available in our country.
Please tell him try to design their truck like this attached old tracks for example.
Secondly, I want ty