Could I have extracted more bets?

[JasonM]

SH 25-50 hand from a while ago.

I get A [img]/images/graemlins/spade.gif[/img]A [img]/images/graemlins/diamond.gif[/img] in MP, folded to me and I raise, folded around to big blind who 3 bets (the only way to describe the big blind is a maniac), I call. Heads up for 3 small bets each.

Flop is A [img]/images/graemlins/club.gif[/img]Q [img]/images/graemlins/spade.gif[/img]Q [img]/images/graemlins/heart.gif[/img]

Big blind checks, I check.

Turn is a 3 [img]/images/graemlins/spade.gif[/img]
Big blind checks again, I bet, now he check raises me, I 3 bet, he caps.

River is a 2 [img]/images/graemlins/heart.gif[/img]
He bets, I raise, he 3-bets, I cap.
My hand is good.

My question is, could I have gotten any more bets out of him or did I get the maximum? The only hand I could possibly put him on is AQ so my thinking is that he was willing to cap the whole way.