Do you have anyone in your family that is a truck driver, they earn a living by driving a semi truck
I actually don't, but I have a friend that does! It's a tough job. The hours are really long and driving the truck is a lot more exhausting than it looks.
Although they do provide an essential service by transporting goods and raw materials over land - 
They do. It's a very important job! Don't you need a special license to do it?
In the US, I believe they need a CDL License - and part of that is that they are responsible for inspecting their vehicle for issues related to safe operation.
Ahh makes sense. Safety is very important. I would think they needed specialized training too, parking a semi truck can't be easy!
materials.
United States Pre-1992.
Driving commercial motor vehicles (CMVs), which are primarily tractor-trailers (or Longer Combination Vehicles (LCVs)), requires advanced skills and knowledge above and beyond those required to drive a car or other lightweight vehicle. Before implementation of the commercial driver's license (CDL) Program in 1992, licensing requirements for driving larger vehicles and buses varied from state to state.
Many drivers were operating motor vehicles that they may not have been trained or qualified to drive. This lack
capture that 'tanker-truck' feeling, the sense of a big machine grinding unstoppably through town" and further stated: "I thought I should be driving a very, very big truck to try to wake this person who's asleep, so I get the biggest truck in the world, and I'm so mad I've got metallic teeth, because when you're really angry, you grind your teeth. So I have to go to the dentist, who tries to steal away from me a diamond I do