Work easier not harder. A Lot of that depends on your service rank(not always being stuck with the hand freight and residential)and not being overly chatty with customers and keeping them focused on getting their crap off the back of your trailer. One thing I highly recommend when possible is when you have single shipments is to bring the next stop or two back to the door as a customer unloads you, not up and down out of the trailer as much and saves wear and tear on your knees. As far as the chatty part goes, at one point in my career I realized that between 15 years of servicing some customers from time to time between two different carriers that I did not know any of their names or any thing about them like some drivers might and was not getting any invites to partake of free food opportunities and such as some drivers would report. I was very focused on getting done early and sticking the new hands who came in later with the pickups and me going to the casa.
I am sure average customer thought me to be a large phalace and almost catatonic. I got a little sunnier and began actually looking at the name on their shirt or on the bill they signed and honoring them with the use of said name from time to time. A few of them seemed taken aback by this and would ask about me if they did not see me for a while(hey,the guy with a personality like a bag of rocks...where has he been lately)and more importantly gave me a foundation for getting unloaded right at lunch,break time etc, etc, instead of running for the hills and laughing.