I'm the guy you are looking for, reliable English-speaking local driver with license, a good guide familiar with this country, supposed your buget is for this kind of travelling method.
I'm not showing an AD. here, but offering a solution to people who are confused how to travel as they wish in China.
I have my own job in a hospital, and like to communicate with people from abroad, I'd have several days/weeks off my job to meet your days. all you have to do is to prepare to rent a van at your starting city(chain car rental can give it back in different cities, I have a private car not van), make up for my job loss and my relevant personal expenses based on actual situations, no other expenditure absolutely, and of cause if you are satisfied with my service and tip me a little I'll not refuse it. ^_^