Hand vs total maniac

[rt1]

Last night a bunch of 2+2ers and I were playing in this low stakes 3/6 lhe game. There was some guy there who was a total maniac, raising every hand no matter what down to the river. It was pretty fun, we all had a great time chatting it up with this guy. He was really funny actually.

Anyway, I had position on this guy so any hand I was playing I would auto 3 bet no matter what to isolate it HU vs him. I had AJo in one hand and managed to get it HU vs our friend. The board was QQ88T by the river. How many bets do you put in on the river?

Thanks!