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meech, you'll need quick disconnects for fill/empty as the sac's come with standard fittings. once you put in the quick disconnects, they are plug and play.

Mofierka,
I don't know of any bags that are bigger and fit in the ski locker.. does not seem to be any space when mine is full.
Couple of options... tailgates description above, or an integrated...

Hammer,
I have the 750s in my lsv.. if you fill them full for wakeboarding, you will need more more weight in the bow.. Some guys add 400-600 to the bow to run the 750s full .. I pulled a kid who...