Trucking Glossary

Learn what a hopper bottom trailer is, what it hauls, how it unloads, and why it’s one of the most common trailers in agriculture and bulk commodity trucking.

Learn what an S-cam brake is, how it works, why most semi trucks use it, and what CDL drivers should inspect before every trip.

Learn what deadhead means in trucking, why truck drivers deadhead, how it affects profits, and how it differs from bobtailing.

Learn what landing gear is on a semi trailer, how it works, why it matters, how to inspect it, and common mistakes CDL drivers should avoid.

Learn what a Conestoga trailer is, how its rolling tarp system works, what it hauls, and how it compares to flatbeds, step decks, and dry vans.

Learn what off-tracking is, why semi trucks cut corners, what causes it, and how CDL drivers safely manage turns to avoid accidents.

Learn what a Jake brake is, how it works, when to use it, why it’s loud, and why it’s one of the most important safety features on many semi trucks.

Learn what a kingpin is on a semi truck, how it works with the fifth wheel, why it matters, and how to inspect it for safe trailer connections.

Learn what GCWR means, how Gross Combination Weight Rating works, why it matters for CDL drivers, and how it differs from GVWR.