Upgrading locker ballast / fuel tank support ?

[Ruger761]

Currently Ive been throwing in a 350lb bag that only gets to about 300ish due to wrong size into the rear locker. Looking at swaping it out to a better fitting sac.

My 2 options are

Fly High Tube sac at 370# (62x16x10)

or

Fly High Rear Seat Sac at 650# (60x26x10)

The locker itself measures in at 21 x 73 x 10. So the larger sac wouldnt fill all the way but rougly 550 or so. My question is will the fuel tank support that much weight? Right now there is really no support over it but a 1/2" piece of plywood.

[boardman74]

I used to run a 370 in the trunk of a different brand boat and never had an issue. Same set up, just a plywood bottom with the tank underneath. I think the 650 might be a problem plus thats a lot of weight that far back.

[Ruger761]

Ya I'm thinking the 370 is the way to go as well. Plus leaves room for a future Jabsco pump. Hate to push my luck with the tank and don't really want to build any supports