Any weatherproof boxes for extra battery/electrical/inverter?

[Youngunner]

I'm looking to add a dual battery system, second fuse block, inverter, etc. Any ideas of a secure and weatherproof storage system? I'm not sure if I should put it all in the extra cab area of my tacoma or in a bed mounted box?

 

[Superu]

Check out West Marine

They have a good selection of water resistant and water proof accessories that may suit your needs.