Stack-a-donk in 3b pot?

[Djeorge]

Re the "you are behind when called" thing, I don't think that's the issue:
if he has a worse made hand, c/r is best since he isn't betting the river with them.
if he has a better made hand, c/r=c/c because you can't call turn and fold river imo.
if he's drawing, c/r is better
if he has a random bluff, c/c is better, but a pure bluff is pretty unlikely i think.