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I agree, I did feel a bit vulnerable.

Understand that this is a small town, many people here know each other and the attitude is generally relaxed and friendly.

However, I felt in control enough and my spidey senses had kicked in too.

He started out very friendly and just wanting to know more about the car.
After he made three attempts to purchase it I was more and more direct with "It's not for sale", it sunk in, he got back in his truck and left.
I did keep a sharper eye on my rear view mirror when I left a couple hours later for a black Ram or anybody else following me.

The guy trying to buy my car was way more vulnerable from my POV:

He drove onto private property.

He flashed cash- a completely bone headed move.

One large German Shepard was keeping a close eye on him and staying off to one side.

There's only one way in or out of that area.

He had no idea who else was in the house 25 yards away (there was) or if he was under electronic surveillance.

My buddy that owns the property stayed off to one side just inside the garage as this unfolded. No way for the guy trespassing to know if either or both of us were armed.

It was a new and unique situation for me, I did learn some things and will take a less friendly approach if anything along that line happens again.