I don't. FWIW, Im not sure that Google actually does the driving. I suspect that the driving is contracted. I base this on having seen the job ads for drivers in this area (the contact was not Google) and the fact that the local Google truck parking lots were at businesses that had nothing to do with Google directly (for example, a local land survey company).
Sounds like a good gig if you like to travel. Then again, I’m sure you’d have to go to the big city Amish areas.