Hero is recreational player, playing weak tight loose passive under rolled in a 5/5 game because couple of regulars are drunk. V is not-drunk LAG regular, who has e.g. 4bet pre with 48o and shoved when he hit two pair otf. H stacked v earlier when v went for three streets of value with tptk against h's flopped set. Worth to note, this was the last hand played before they closed the poker for the night. OTTH:

AQo, sb, 1100

pre: V 20 from ep (typical pre raise is 15 or 20), another v (regular, drunk) calls, h calls from sb, unknown calls from bb.

flop (80): at5r: h bets 40. only V calls.
turn (160): tx, h checks, v bets 80. h calls.
river (320): 5, h checks. v bets 280. H???

Would 3! pre and cbet flop (or fold pre to 4!) be better line here?

3bet pre to 120 if you are the effective stack, as played super tough river decision, probably fold

Bad situation against a LAG with some sense. Villain has TX in his range and knows that you probably don't.

For the most part I would have made my plan on the turn. Either fold then or plan to call river because against a 5/5 LAG I expect him to bet both streets most of the time. My inclination would be to fold turn exactly because I expect him to bomb river no matter what he has but against a typical LAG you have to call this off sometimes.

Why did you lead flop

my thinking was I'm probably good with tpgk against lag open range + no further aggression pre.

we are effective stack against v in question.

given we 3bet pre how would we play flop? cbet-fold or check-call given we face aggression?

I have hard time assigning a range to v both on the turn and river. What would you assign based on action and description?

The thing about a LAG is that they are hard to assign a range in this situation, that is what makes them hard to play against.

A LAG is calling flop with any AX/TX/KK-JJ, probably calls with gut shot draws and might stick around with a few other hands that could improve to draw on the turn. That is actually a fairly tight range for a LAG but on such a dry flop he knows that everything except the good AX is likely behind at the time. He calls because he might draw out and might be able to take the pot away later. When you fail to bet the turn he bets any hand that beats you and some of the time with other hands.

His range is more polarized when he bets river big. He likely checks his AX that might be good anyways on the river. His betting hands are the ones that beat you and bluffs. His range of potential bluffing hands is wider then his value but those hands don't always call flop, don't always bet turn and don't always bluff river so the ratio between better hands and bluffs depends on villain.

I 3bet pre or fold so that I don't get stuck in this exact situation. I also check/call the flop. Let him hang himself. River is tough and I would like to know more about V's betting tendencies. In the heat of the game, I probably make the call.

Thanks for the feedback, results below, if it matters: