Man thats gonna be a challenge. How about under the rear seat? I have a 400# in the ski locker then a 750# under rear seat and a 750# in bow. I can get a decent wake without filling the ski locker bag though. Not to many options if you are dead set on keeping the use of the ski locker. On a side note I keep all kinds of crap in our ski locker and still able to fill the bag.
84 Supra Marauder
Monster Tower
Monster Cargo Bimini
4 Kenwood Tower speakers (6.5)
4 Kenwood Interior Speakers (6.5)
2 Kenwood 6x9 rear seat kick panel
2 Kenwood 5 1/4 in dash
1 Kenwood Sub
2 2ch Kenwood amp 1 2ch Fosgate amp
2 4ch Kenwood amp 1 4ch Fosgate amp
1 2ch Kenwood (bridged) for sub
STRAIGHT OVER KILL.