The Road Warriors are all androids. A military android searching for a purpose came upon the original Road Warrior (yes that one) as he was dying. The android took up his cause. That first android has repaired and copied his programming to many other androids. The player may not may not know they are an android.
All Road Warriors have a V-8 Interceptor. None of them have THE V-8 Interceptor. Whether they know it or not, each Road Warrior has the full plans for the vehicle in their memory. They build or convert an existing vehicle into something that resembles the original.