How about delivering Tesla cars straight to customer's doors?
Amazon-shipping style.
Here is the existing unmanned heavy-lifter.
http://en.wikipedia.org/wiki/Kaman_K-MAX#Unmanned_remote_con...
Can carry 6,000 lbs and the cost of $1,000 per flight hour total isn't a terrible price, it's far more expensive than just putting the vehicle on a truck for delivery of course.
http://www.lockheedmartin.com/us/products/kmax.html
https://www.youtube.com/watch?v=ukogay1TwAA
https://www.youtube.com/watch?v=5qqUdfSRFXw
The way those rotors cross are insane.
The BlackHawk unmanned system has been in testing for several years also.