Possible Clues:

• Maker of Terrain and Acadia SUVs
• Yukon mfr.
• Sierra manufacturer
• Yukon SUV mfr.
• Chevy sister make
• Maker of Acadia SUVs
• It has pickup lines
• Maker of the Envoy and Yukon S.U.V.'s
• Envoy XL maker
• Maker of Yukon SUV's: Abbr.