If I'm trading for a used ranger from someone in Oklahoma and they don't have a title should that be a red flag? If not what should I ask for and what do I need to know about with trading out of stated (taxes, titling, etc)?

Of course it's a red flag. The fact that its out of state will compromise things even more since there's no title, I'd walk away.

Is it a dealership?

No it's an individual. From what he's said and from what I've found searching the internet is that in Oklahoma a title isn't required for a utv so very few have them titles. From my understanding if he has the manufacturers certificate of origin it's similar to the title. Any truth or insight on that?

Call a UTV dealer in OK and ask them. Should have better knowledge of law and such.

I try to stay away from that state it makes my stomach hurt