When to push a hand hard...

[Poker_Ink]

my question here is a general one, and may be hard to answer...

Anyway, I find it hard to know when to push a mediocre-strong hand hard, particularly against agressive/loose opponents.

One example is in the following: the SB is extremily bad, with 64.6/28.32

Party 1/2 6-max (6 handed)

I am BB with 2 [img]/images/graemlins/heart.gif[/img]3 [img]/images/graemlins/heart.gif[/img]
2 calls, SB calls, I check.

Flop comes: 4 [img]/images/graemlins/heart.gif[/img]2 [img]/images/graemlins/club.gif[/img]2 [img]/images/graemlins/spade.gif[/img]
SB checks, I bet, two folds, SB raises,
I re-raise, SB calls.

Turn comes: K [img]/images/graemlins/spade.gif[/img]
SB bets, <font color="red"> What do I do here? </font>

With my read and his stats, I want to push harder, but my kicker is trash, and even maniacs can get lucky. I guess the general question is do you always push hard against these maniacs? I know my trips is a good hand, but not amazing...