ok, the only reason i don't worry about the river line is that at lower stakes i find almost no TAG opponents will raise that river without beating your hand. And many will bet on a steal so you will have to call. The question is, do more weaker hands call your bet that would have checked than weaker hands that would have bet the river for you to call.
If you can give your opponent credit for the river raise witha bluff then you have a whole new discussion, here, i did not.