Rcm om vehicle hire charges

We are a logistics company and hire Goods Vehicles for Local and outstation movements of our Customers Cargo to be sent by Rail/Air Cargo or road. Since the Individual vehicle owners are below the threshold limit as per GST rules, will they be treated as exempted category or unregistered persons. 2. Since our services are Door to Door pickup and delivery, our services come under Courier agency as well as GTA and our Customers are charged a comprehensive rate which includes pickup, loading unloading, clearance and delivery charges at the delivery point. Under GST we will either charge 18% GST for Courier charges and 5% for GTA services. My query is what happens to the RCM paid by us on Vehicle hired by us.