Cranky,
I am not sure of any 12 foot crankin rods, however I do remember someone on this site a while back had either had them made or found a place that sells some.
Have you had a chance to check out the 10’6″ St. Croix Wild River Series Rods?
I use these for planer board fishing. I have used these rods for 3 years now and absolutely love them for board as well as pulling 3-ways in the river. They have 2 different blanks for the 10’6″ model. One is a light action 10’6″ for lighter applications and the other one is slightly stiffer, but lots of bend all the way down the rod. I like running lighter action rods for boards compared to most people and really come to like the action the board has with these rods. No hurky jerky motion from surging waves and stops and starts.
Hope this helps you out a bit?
I will try to find out where I saw that info on the longer 12 foot rods.
Good luck.