Possible Clues:

• Some S.U.V.'s
• Safari and Yukon
• Sierra and others
• Sierra and Acadia vehicles
• Yukons and Envoys
• Some made-in-Mexico SUVs
• Yukons and Terrains, e.g
• Yukon and Acadia, for two
• Sierra, Yukon and Acadia
• Envoy and others