A six passenger Vehicle to rent

I want to rent a six passenger vehicle to drive from:
1. Shanghai to Beijing
2. Beijing to Xian
3. Xian to Chengdu
4. Cheng-du to Chongqing
Can you give me a name of a rental company that will give me the cost to go from one city to the other? Or can I rent the vehicle in Shanghai and turn the vehicle in when I get to Chongqing?