Another AK hand - Too Aggressive?

After responding to several AK posts this week, I finally had one of my own. (Sorry that Bison HC doesn't like Full Tilt) - Critique on all streets is greatly appreciated as this is one of the most difficult hands for me to play at 2/4 or 3/6.

First orbit, so no reads, but I usually give 2/4 FT players the benefit of the doubt until proven LAG . . .

Full Tilt - $2/$4 - Limit Hold'em - 22:09:26 ET - 2005/12/03
Seat 1: tupelony ($28)
Seat 2: rufus9 ($83)
Seat 3: LittleNevada ($104)
Seat 4: reissmgr ($123)
Seat 6: Thepull ($80)
Seat 7: sperel ($93)
Seat 8: Beachman ($55)
Seat 9: Wdstk3 ($91)
reissmgr posts the small blind of $1
Thepull posts the big blind of $2
The button is in seat #3
*** HOLE CARDS ***
Dealt to Beachman [Ac Ks]
sperel folds
Beachman raises to $4
Wdstk3 folds
tupelony raises to $6
rufus9 folds
LittleNevada folds
reissmgr folds
Thepull folds
Beachman raises to $8
tupelony calls $2

*** FLOP *** [5d 4d 6s]
Beachman checks
tupelony bets $2
Beachman raises to $4
tupelony calls $2
*** TURN *** [5d 4d 6s] [5s]
Beachman bets $4
tupelony calls $4
*** RIVER *** [5d 4d 6s 5s] [As]
Beachman bets $4
tupelony calls $4