3/6 Weird river spot with AA

[AAismyfriend]

Villain doesn't seem very good, and seems to be playing pretty passive overall, and he is one tabling. I would autoshove this river vs most, but his bet sizing throws me off a bit. Should I just be calling here? who likes shoving? It's like 375 more to him if I shove.

Full Tilt Poker, $3/$6 NL Hold'em Cash Game, 5 Players
LegoPoker Hand History Converter

SB: $826.65
BB: $1,742
UTG: $94.20
Hero (CO): $1,283.15
BTN: $530.50

Pre-Flop: A[img]/images/graemlins/heart.gif[/img] A[img]/images/graemlins/club.gif[/img] dealt to Hero (CO)
UTG folds, <font color="red">Hero raises to $21</font>, BTN folds, SB calls $18, BB folds

Flop: ($48) T[img]/images/graemlins/heart.gif[/img] T[img]/images/graemlins/diamond.gif[/img] J[img]/images/graemlins/club.gif[/img] (2 Players)
SB checks, <font color="red">Hero bets $36</font>, SB calls $36

Turn: ($120) T[img]/images/graemlins/club.gif[/img] (2 Players)
SB checks, <font color="red">Hero bets $100</font>, SB calls $100

River: ($320) 5[img]/images/graemlins/club.gif[/img] (2 Players)
<font color="red">SB bets $306</font>, <font color="red">Hero ???