This type of vehicle refers to equipment that can complete more specialized operations and change the structure and model of the vehicle according to different purposes, such as sales trucks, garbage trucks, sweepers, sprinklers, environmental monitoring trucks, and cement mixers , Dump trucks, sewage suction trucks, fecal suction trucks, aerial work trucks, refrigerated trucks, lifting trucks, advertising trucks, power station trucks, repair trucks, exploration trucks, oil fracturing trucks, scientific investigation trucks, police trucks, Fire trucks, aircraft tractors, fuel trucks, rechargeable trucks, air compressor trucks, ambulances, medical facilities trucks, library trucks, television relay trucks, post and telecommunication trucks, snow removal trucks, etc.