My dad, my sister and I are thinking of going to a car swap in Monroe Washington to sell her car and perhaps mine, and get me and/her a car. Has anyone ever been to a car swap? What are some tips to get the most out of our cars and time there?

She has a 86 Dodge 600 Turbo'd convertible
She wants to get a Mini Cooper(Perhaps)

I have a 94 Integra LS Sedan
I want a CRX

We're going to take 2 or 3 cars over.