I am agree with view of the expert but there is one another angle of this transaction also.
Sr. 18 of Notification No 12/2017-CT (Rate) exempts Services (HSN -9965) i.e. by way of transportation of goods by road except the services of a goods transportation agency and a courier agency. It means if the transportation service is not provided by GTA, then not taxable (goods transport agency means any person who provides service in relation to transport of goods by road and issues consignment note, by whatever name called). So no need to pay GST on RCM basis for the services provided by individual vehicle owner who is not a GTA.