Nut Straight but TONS of action

[Hyperrrprank]

15/30 Hawaiian Gardens

EP is somewhat passive, reasonable player. MP is TAG with some oddball betting mixed in, may be less skilled then he looks but haven't seen enough hands to know for sure. SB is loose passive who likes to chase.

Preflop:
EP calls, EP1 calls, MP calls, Hero calls on the button with 6 [img]/images/graemlins/diamond.gif[/img]8 [img]/images/graemlins/diamond.gif[/img], SB calls, BB checks.

Flop: 6 handed, 6SB
5 [img]/images/graemlins/club.gif[/img]4 [img]/images/graemlins/spade.gif[/img]7 [img]/images/graemlins/heart.gif[/img]
SB checks, BB checks, EP bets, EP1 folds, MP raises, hero 3-bets, SB calls, BB folds, EP calls, MP calls

Turn: 4 handed, 9BB
4 [img]/images/graemlins/club.gif[/img]
checked to hero, hero bets, SB calls, EP folds, MP calls

River: 3 handed, 12BB
8 [img]/images/graemlins/club.gif[/img]
MP bets, hero calls, SB calls

Comments on any streets? Assume I know the preflop call is marginal, I'm fine with a fold here most of the time. The table was pretty aggressive so having it limped to me was a pretty good sign of weak cards from the other players and position gave me a good shot at the pot if no one hit.

How do people feel about the bet on the turn knowing there could be a fh out there?