I'll be re-doing some of my electrical soon, and when I do, I'll have to take some pics.
The Odyssey can be purchased with a metal shell. The battery is siliconed into that shell, just a touch on the front and back, easily cut and removed from the shell.
I then took 6 heavy duty rivets and attached the shell to the stock mounting surface. It sat this way with a piece of 1x1 metal under the stock battery bracket until I was able to get a new one fabricated. The Odyssey is shorter than the stock battery.
You can read more about it here:
http://www.4wdtrips.net/forum/showpost.php?p=70118&postcount=17
FYI: Bruce TS just posted a pic of either a 4runner or a Tacoma with two optimas mounted in the same spot, side by side, I wouldn't worry about the ability of the truck to support the weight.