Smoo, the glider was the last loophole bastion for the owner operator and could legally NOT fit DPF emission crap even ECM diesels.
Now there's a new way around it, its called gather up as many old school trucks (1998 and older) as you can and refit them with mechanical injected diesels.
ie their favour A model 3406 Caterpillar.
2016 Glider information.
https://www.dot.state.wy.us/files/li...esentation.pdf
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