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INVENTORY (Tables) | 12 Months Ended
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Dec. 31, 2023
INVENTORY |
Schedule of inventories, net of reserves | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
(in thousands) |  | 2023 |  | 2022
Chassis | ​ | $ | 29,748 | ​ | $ | 18,604
Raw materials | ​ |  | 89,048 | ​ |  | 75,934
Work in process | ​ |  | 47,934 | ​ |  | 40,655
Finished goods | ​ |  | 23,077 | ​ |  | 18,463
Total inventory | ​ | $ | 189,807 | ​ | $ | 153,656

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