The relative and subjective part is exactly that, relative and subjective.
Where it gets kinda mixed up, and probably varies in different states, is when the body and frame are separated and one or both are reused and back on the road. If I took my "Wrangler" body off and put a Gremlin body in it's place, is it a Wrangler or a Gremlin? Which is cheaper to register? Which is cheaper to insure? Which way is legal in Ohio?
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Six months later some guy knocks on my front door and says, "Hey dude. I keep driving by your house and I see that pile of Jeep body parts just sitting in front of your garage. Wanna trade for a couple bottles of moonshine?" Well the wife has been complaining about that pile so how could I say no to that offer? A couple more months go by, I get another knock on the door, and what's sitting in my driveway? This:
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Should that be titled as a Jeep or a Toyota?