Villain is unknown.

For me it feels like he was buying a flush, it looks like its too much of risking so much big blinds with three of a kind on this board.

What would be your bet sizing?
If you would played it differently, whats your comment?

I think you have to bet flop bigger. Your value target is a Q or a FD, both of them will pay a bigger barrell, around 130. Besides, you have 3 opponents, is quite probable that one of em will pay anyway.

Also, Id like to see a bigger turn bet for the exact same reason, around pot size.

Once he shoves... well, Id fold as well, although it might be exploitable on the long run but I dont see why he would turn his Q or some other value hand into a bluff. Hes quite polarized and considering hes an unknown at 2.5 180s hes most likely to be a fish that tried to hit and got there on the river.

^ +1

preflop: ok

flop: bet bigger to 150

turn: bet bigger to 285

river: nasty, but we have to fold readless, rarely a bluff

UTG has 1067 behind and leads 633, unknowns play the nuts like this