[Bob Steele]

It will be interesting to see how this comes out.
I don't believe any doubling would occur (there is no provision for doubling of ubertube scores...) and I can guarantee that you could not put a third tube on the peg (not enough room) for end of game doubling.
I would hope that this sort of thing would be 12 points..same as 2 ubertubes on 2 pegs..

I wonder also if an ubertube is scored during auto and knocked off during game play if the double score for that peg would still result.

This has probably been answered... I am just too tired after a long regional to search very far.