Training For A Route Driving Job. What Do I Talk About While We’re Driving?

I have a route sales driving job I’m starting on Monday. Training takes 1-2 months depending on how fast I pick it up. I’m not concerned about the actual job, but more so about spending 8-10 hours a day in a truck with my trainer. I’m naturally a shy person and I fear there will be lots of awkward silence in the next 2 months. I will ask lots of questions, but you can only ask so many questions. If this guy isn’t a very outgoing person, it could be very awkward. What do you guys think? Have any suggestions?