Flopped Trips And I Only Bet Once?

relevent stack $145

Preflop: Hero is Button with A[img]/images/graemlins/spade.gif[/img], K[img]/images/graemlins/spade.gif[/img].
<font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises to $7</font>, SB calls $6, <font color="#666666">1 fold</font>.

Flop: ($16) A[img]/images/graemlins/club.gif[/img], J[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, Hero checks.

Turn: ($16) 5[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, <font color="#CC3333">Hero bets $10</font>, SB calls $10.

River: ($36) Q[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, Hero checks.

Final Pot: $36

okay, so this guy was a 42/6/6, and had a went-to-shodown-when-seen-flop (what's the acronym for that again?) 19%

Had ~400 hands on him

So basically, I think he's too much of a TAG postflop to be check-calling the flop here

Eh?