100NL: River valuebet w/ 2 pair, too thin?

[We Major]

Villain is 28/3.5/1.5 over 200 hands. I was trying to get value from an AJ, AQ , AK type hand. It was close in my mind between checking behind on the river.

Full Tilt No-Limit Hold'em, $1 BB (6 handed) Full Tilt Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

CO ($116.90)
Button ($50.50)
SB ($122.20)
BB ($34)
UTG ($167.10)
Hero ($132.35)

Preflop: Hero is MP with A[img]/images/graemlins/heart.gif[/img], T[img]/images/graemlins/heart.gif[/img].
UTG calls $1, <font color="#CC3333">Hero raises to $4.5</font>, <font color="#666666">4 folds</font>, UTG calls $3.50.

Flop: ($10.50) A[img]/images/graemlins/club.gif[/img], 5[img]/images/graemlins/spade.gif[/img], T[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
UTG checks, <font color="#CC3333">Hero bets $8</font>, UTG calls $8.

Turn: ($26.50) 4[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
UTG checks, <font color="#CC3333">Hero bets $20</font>, UTG calls $20.

River: ($66.50) 7[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
UTG checks, <font color="#CC3333">Hero bets $30</font>, UTG calls $30.

Final Pot: $126.50