Engine outputs are up to 430 HP for the Navistar N13 and up to 600 Hp for the Cummins ISX 15 liter engine.
Depending on the engine the hood is longer or shorter. Also there are models with a set-back front axle.
The trucks are segmentend in dump, concrete, heavy haul and crane specifications. Aluminium cabs, fiberglass hoods and metal grilles complete the HX series.