River bet or not?

You could bet this, but i'd understand if you check back here, as its slightly on the light side.

The only real hand that's beating you is KJ or some fancy slowplayed set/QT.

So we are trying to extract value from a single Jack or King, these are weak hands so we can't bet big. If you bomb the river with a 75% bet he'll probably fold.
If we bet somewhat near 33% he'll probably call. if he raises we can easily fold, we block most flush draws and x/c x/c x/r isn't a bluffheavy line so we're beat 99.9% of the time.

I would just usually check there. I don't see villain calling a third barrel with too many weaker hands and as Varune said we can't bet too big. If we bet small it might induce some bluffs.

Vs. a weaker opponent I would choose the bet river line. Otherwise I agree. Would also fire flop and turn larger