Many people will call an 18-wheeler a “truck.” But it is actually a tractor-trailer, made up of the tractor (the power source) and a trailer of one kind or another.
The three most common types of trailers are dry vans, refrigerated trailers (reefers) and flatbeds. There are hundreds of thousands (perhaps millions) of trailers on roads and highways across the United States each and every day.
But how were trailers first developed, and by whom?
Ea...