Those boxes you'll find underneath the cab and trailers of larger trucks have a very useful purpose. Here's what they're for and what you'll find in them.

Light bars are nothing new. They've been popular truck accessories for years, much to the chagrin of casual drivers, and they can drastically increase a pickup's utility.

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Drivers are often taught about truck technology on a need-to-know basis. Basic driver training probably doesn’t include full instruction on how engine brakes work. Photo: Jim Park ...