itc credit to GTA

I'm into transport business a GTA. I hire trucks from market & send the material as per the delivery schedule . I Bill to my client whose material I delivered. the client pay the tax under RCM. the truck supplier Bill to me for the truck I took on hire from him . truck owners are registered as well as unregistered. my query is wether I need to pay their tax under RCM or not ? further wether any ITC is available to me on such payments. Please clarify . Thanks