[delegator]

I asume he is fastplaying a four on flop, and does not like the turn, so he check calls on turn to try to spike a full house on river, he now treats his hand as a draw or a bluffcatcher and hoping it will go check check on river. Since trips obv has some kind of showdownvalue.
Something that leads me towards thinking he has at least a four is that u overbet the pot on turn and he calls out of position. If i where in this spot i would bet like 7-800 on river for value,but not be very surprised if he shoves allinn with 4 9 offsuit or maybe calls with king four with king of hearts.