3/6 I flopped trips villian goes nuts on the river

[MexKrax]

Villian in this hand is loose and a little passive post flop 50/18/1.

Party Poker 3/6 Hold'em (6 max, 3 handed) hand converter

Preflop: Hero is BB with J[img]/images/graemlins/spade.gif[/img], 8[img]/images/graemlins/spade.gif[/img].
Button calls, SB completes, Hero checks.

Flop: (3 SB) T[img]/images/graemlins/heart.gif[/img], 8[img]/images/graemlins/diamond.gif[/img], 8[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">Hero bets</font>, Button calls, SB calls.

Turn: (3 BB) 3[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">Hero bets</font>, Button folds, SB calls.

River: (5 BB) K[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>, <font color="#CC3333">Hero 3-bets</font>, <font color="#CC3333">SB caps</font>, Hero calls.

Final Pot: 13 BB

Was 3 betting the river a bad idea here? I put the villian on something like KT. Of course this could also have been a slow played 8 with a better kicker.