Went with a 20 x 20 x 50 Fly High Fat Sac and Tsunami pump.
This will fit into the rear of the ski locker nice, it will just be about 7" taller than I need so it won't get filled all the way (or the ski locker lid won't get closed all the way
).
We might just shove some weights or possibly eventually get a smaller sac for the front of the ski locker. Still have about 12" x 12" x 32" of wasted space up there (another 165#).
But I need to see where else the weight should go in the boat first. This will get us by until spring.
Thanks for the suggestions.