Factory steel bumpers, Boron-steel skid plates make Bison ready for off-the-grid adventures 2018-09-06 DETROIT — The Colorado ZR2 Bison joins Chevrolet’s midsize truck lineup as an all-new performance variant. Bison is Chevy’s first collaboration with American Expedition Vehicles (AEV), a premium off-road aftermarket manufacturer. Through constant innovation, Chevy has gained more than a quarter of all midsize truck sales in less than four years in the marketplace. In consecutive years, Colorado introduced the segment’s first diesel engine (excludes other GM vehicles), an all-new V-6 gas engine/eight-speed transmission combo, the ZR2 “segment of one” off-roader and now the Bison. For maximum protection of key undercarriage elements while driving over rocky, jagged terrain, Bison features five skid plates covering the engine oil pan, fuel tank, transfer case and front and rear locking differentials. Designed by AEV, these skid plates are constructed of hard, durab