ITC on vehicle hiring services

sir i want to do business of vehicle hiring services. my firm is proprietorship firm and service recipient is a body corporate. my confusion is 1) if i will charge 5% GST than service recipient will make the payment in RCM than how i will claim the ITC of the GST amount paid at the time of purchase of the car. 2) if i will charge 12% GST in bill than whether i can claim the ITC of GST amount paid at the time of purchase of car. 3) in both cases whether i can claim ITC on Insurance and servicing of car.