Bjs:

Note the folds on the river on those last two hands. As you said, these guys are calling stations. But their tendency is to eventually realize (way too late) that they are behind. In other words, I suspect if you look at their showdown statistics, they don't show down too many pots or lose too many showdowns. They just call too much on flop and turn.

So, it seems to me that the strategy with this type of player has to be to extract your value on flop and turn. Indeed, if they call you on the river, that's probably a bad sign-- perhaps they made their hand! So in your bet sizing, I would think heads up against this type of opponent a plausible strategy might be to bet as large as you think Villain will call on flop and turn, and size your river bet large enough to deter a raise but small enough that the Villain may still call with a weaker hand.