The crossword solution for the term 'THEY'RE GOOD FOR THE LONG HAUL' is SEMIS, which stands for semi-trailer trucks. Semi-trailer trucks are large vehicles used to transport goods over long distances. They are designed to be able to carry heavy loads and are capable of travelling long distances without needing to stop for rest or refueling. They are an important part of the transportation industry and are often used to move goods from one place to another.