From your other thread.......
I have a 2000 Launch. We run the hard tank in the back filled. I found a sac that was made for the rear storage locker on ebay, I believe the dimensions are 70x16x16, it is approx 400 lbs.
One more thing - don't put more than 100 lbs in the trunk (rear ski locker). It is directly over the gas tank and it is not reinforced at all. That is the max trunk weight I was quoted by Supra.
Your best bet might be PMing the 2 guys who made those posts in your thread. Or contact Supra yourself if you don't believe the guy who made that 2nd statement. We never put any weight in that locker when we had our Launch DD. Also maybe it is just me but wouldn't it be easier to keep all the discussions about your boat to one thread? That way you can find all the info you want/need in one place.