A SEMI is a type of truck that has a tractor and one or more trailers attached to it. A TANKER is a type of truck that is designed to transport liquids or gases. A PANEL truck is a type of truck that has a flatbed with a roof and sides. A flatbed is a type of truck that has an open-top cargo area. UPS is a type of truck that is used for package delivery. Lastly, a TOW truck is a type of truck that is used to TOW or haul other vehicles.