You can install our site as a web app on your iOS device by utilizing the Add to Home Screen feature in Safari. Please see this thread for more details on this.
Note: This feature may not be available in some browsers.
My guess trade in would be low $40's since tesla sells used model S 60s for $47.5k with 32k miles plus 4 yr / 50k mile extended warranty ($4500 value).
I don't understand why private sales are more than ones from the dealer.