The crossword solutions for the term 'THEY'RE IN IT FOR THE LONG HAUL' are RIGS (4 letters) and SEMIS (5 letters). RIGS stands for 'rigid haulers', which are large trucks with a trailer that is permanently attached to the cab. SEMIS stands for 'semi-trailers', which are large trucks with a trailer that is not permanently attached to the cab. Both types of vehicles are used for long-distance hauling, and the phrase 'they're in it for the long haul' implies that the drivers of these vehicles are committed to their job and will stay with it for the long term.