Navistar brought several of its truck models to the 2013 Mid America Trucking Show, including two ready-to-sell ProStar tractors equipped with its new MaxxForce 13L SCR engine. The OEM also brought it's 'Project Horizon' demonstration vehicle to the show, as well as a Cummins ISX 15L SCR engine that Navistar has been selling in its heavy-duty trucks since December 2012.