Transporter ID usually require when Tranporter wants to provide Vehicle No. & futher if any break down of vehicle or In Transhipment , the Transporter can easily change the vehicle no.
SUPPLIER CAN GIVE HIS GSTN NO. IN PLACE OF TRANSPORTER ID WHEN GOODS ARE NOT BEING DELIVER BY ANY TRANSPORT CO., MEAN SUPPLIER HIMSELF DELIVERING GOODS IN HIS OWN CONVEYANCE