2-bet turn raiser on 1-card river straight?

[ellipse_87]

No specific reads... I remember the table as being loose and somewhat aggressive.

What factors do you think should go into deciding whether or not to raise the river?

PokerStars 1/2 Hold'em (6 handed) converter

Preflop: Hero is Button with A[img]/images/graemlins/heart.gif[/img], 7[img]/images/graemlins/heart.gif[/img].
<font color="#666666">3 folds</font>, <font color="#CC3333">Hero raises</font>, SB calls, <font color="#666666">1 fold</font>.

Flop: (5 SB) Q[img]/images/graemlins/heart.gif[/img], 5[img]/images/graemlins/diamond.gif[/img], 4[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, <font color="#CC3333">Hero bets</font>, SB calls.

Turn: (3.50 BB) 6[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, <font color="#CC3333">Hero bets</font>, <font color="#CC3333">SB raises</font>, Hero calls.

River: (7.50 BB) 3[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets</font>...