Howstuffworks has a informative video of how factory workers hand assemble an Airstream trailer. It takes approximately 240 – 340 man hours to assemble one trailer. This is one of the reasons why you bought an Airstream trailer and not a generic box trailer. The Discovery Channel’s How It’s Made tv show also has a segment on how the trailer is assembled. You can purchase the episode on iTunes or watch it for free if you’re in Canada.