On turn there a lot of hands that he can raise. 2pairs, str8's, fd's and sets (even if i think sets would maybe raise flop or even 3bet pre since its 88 99 or QQ). On river we can take some of this hands. he doesn't shove 2pairs like 89 or smth because he is loosing to Qx. So he ships there missed flushes, sets and str8's. Only possible set that i see there his 66 that hitted on turn and shipped river. Once again i don't think 88 99 or QQ make a lot of sense since they would or 3bet pre or raise flop.

According to your info ppl are passive posflop so i don't expect him to raise there a flushdraw and then to ship a missed draw. I might fold this specially if its vs a 1 or 2 af player!

I would fold OTR, I don't think that he would push a missed draw on a pair board with that line.
V is repping straight here and maybe 88 that he don't 3bet and slowplay otf (fewer chances)

I think his Jx blocker pure bluffs will likely shut down when the board pairs here. For that reason I am folding river.