good trips in BB on raised multiway flop

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Results:

Paradise Poker
No Limit Holdem Ring game
Blinds: $0.25/$0.50
10 players
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Pre-flop: (10 players) Hero is BB with J[img]/images/graemlins/spade.gif[/img] A[img]/images/graemlins/spade.gif[/img]
3 folds, <font color="#cc0000">MP1 raises to $1.5</font>, MP2 calls, 2 folds, Button calls, SB folds, Hero calls.

Flop: T[img]/images/graemlins/spade.gif[/img] A[img]/images/graemlins/heart.gif[/img] A[img]/images/graemlins/diamond.gif[/img] ($6.25, 4 players)
Hero checks (information), <font color="#cc0000">MP1 bets $1.5</font>, MP2 folds, Button calls, Hero calls (Figured this for a WA/AB with a bet and a cold caller and wanted to minimize the pot and get a cheap showdown.

Turn: 9[img]/images/graemlins/club.gif[/img] ($10.75, 3 players)
Hero checks (same thing), <font color="#cc0000">MP1 bets $1.5</font>, Button calls, Hero calls (Great, now AK, AQ, AT, AND A9 all have me crushed. What is the Loose Passive button calling two streets with? What would MP1 raise PF and bet two streets with? Isn't this what I wanted, a cheap showdown in a WA/WB situation? What hands would call a check-raise in this situation that I beat? So I call for the cheap showdown.)

River: Q[img]/images/graemlins/diamond.gif[/img] ($15.25, 3 players)
Hero checks, MP1 checks, <font color="#cc0000">Button bets $4.5</font>, Hero folds (When a Loose Passive player bets 1/3 of the pot, he likes his hand. Seeing as how most of the Aces that would call a preflop raise are ahead of me, and there is still the original preflop raiser to act behind me who has a slim chance of slowplaying a monster, I don't have over 25% pot odds to call), MP1 folds.
Uncalled bets: $4.5 returned to Button.

Results:
Final pot: $15.25

I'm not sure if Leading Out would get me a cheaper showdown on the River because I might have to call a Minraise. The River also made a straight possible. Somebody could also have made a Full House with a pocket pair at some point so this isn't as weak tight as it seems.