Re: roof top storage bins?
You might try some aluminum military surplus cases. They range in size, are durable, and usually waterproof. Most that I have seen are short and wide with a removable top half. They also have metal handles to loop your cable lock through. Check ebay or a local surplus retailer.
2007 FJ Cruiser 4x4-Titanium metallic w/ Road Armor Titan guard: Line-X'd w/ PIAA 510 Ion Crystal Fogs and 9" ProComp spot lights. PIAA extreme white mirror bulbs & LED interior lights. Toytec 3" Lift w/ 295/70/17 Nitto Terra Grpplers. TRD exhaust. Eclipse CD/DVD/Nav, Parrott Bluetooth, Sirius. TTSE Knobs. MPAC pet barrier, rear and side MPAC racks with STAT pouches. AirLift Air Bags, Prodigy P2 brake controller, Hopkins 7/4 pin combo.