In terms of river over-bet bluffing frequency

I wonder how frequent you guys see an over-bet jam on the river as a bluff?

From my own limited experience, I have rarely seen any big over-bet bluff (OTR) in low stakes in my local casino, hence in the hand below, I wonder whether we can overfold?

1/2. Friday night. 8-handed. Hero just transferred to this table for 5 minutes so no ideas about the table dynamic.

UTG+1 limped 2, 4 limpers, until we saw red Kings on the BB. We opened to 20. UTG+1 was the only caller.

V is a white guy between 25-30 years old. Not much useful information.

Flop 522 rainbow. We bet 40% pot, V called.

Turn J, putting a backdoor FD there, we bet 55 into 90, V looked down at his cards again, tank called.

River another J, now we checked on this double paired board. V jammed 325 into the pot of around 200 and put his poker face on refusing to talk.

Hero?