The previous owner of all Road Runners was Dan Cramer, former employee of Atari. There are two known examples. The games do exist. Additional backglasses do exist. I don't know if he kept both game prototypes, and the backglass was pulled for the PAGG show for protection in 2016 which I found out later in conversation. Too valuable. Game was functional on testing after being rebuilt with rudimentary original ruleset coding.

Yes, you caught my typo in haste.
Dan Kramer can be found on Facebook, and periodically posts there.
He is friends with most older members of the pinball community.
He is still active in the hobby and business, however he is not on PinSide.