Practice question What is a combination vehicle? A straight truck with cargo loaded in the bedA truck or tractor pulling one or more trailersAny commercial vehicle with a GVWR over 10,000 lbA vehicle with both gasoline and diesel engines Answer: B — A truck or tractor pulling one or more trailers The correct answer is shown above. Try the full quiz for additional practice. Practice more: CDL Combination Vehicles Practice Questions - CDL Combination Vehicles Knowledge Test Exam →