This hand is from a 300-600 mix game with 100/200 blinds, 200 in antes, and a 6k cap. Hero is perceived as a winning TAG
UTG, a tight, winning player limps
All fold
Hero checks bb with 66433 ds all black cards

Flop (pot 700)
T 6 2 with two hearts one diamond. I don't remember which card was offsuit.
Hero leads 500. I probably should bet full pot but my sizing was, frankly, lazy. BB calls

Turn (pot 1700 with 5300 left in the cap)
Qh and both players check

River (pot 1700 with 5300 left in the cap)
2. Hero leads 1500 and Villain caps it.

My thought process was that 66622 feels like too strong of a hand in my range to fold, but on the other hand, the 334 blockers along with the turn check/check really limit the sorts of hands he could have had on the flop to call my bet. Opponent-wise, I'll just say that trying to catch this player's river bluffs is not a great way to make a living.

Given your read on villain, fold is fine i guess. Doesn't sound like he would raise q2 or t2 - would he ever turn qt into a bluff?

River sizing seems too large - think we should go half-pot or smaller, or maybe even check.

Default action is fold.

Folding 66622 here is exploitable and bad.... except people don't bluff raise the river enough to think you are folding a winner more than 1/3 of the time, which means it's a good fold.

I'd play the flop as check full range, this hand being an obvious c/r.

I'm tempted to call river and it's clearly the "right" play, but just go ahead and fold if you think villain is so bad he doesn't do this with QT. I don't like your sizings on either street really, though maybe you lose the minimum on the river by betting big and folding.