Just a FYI to anyone interested. I tracked down my Tracer 240 battery tray measurements. It appears it is around 25x8 not allowing for dual 12v but big enough for dual 6v which is what I wanted anyway. I tracked down a nice dual box which can be found here to hold both 6v batteries. Century Plastics: White Heavy Duty Battery Box - (part#: GCE-G)
Also on the subject of batteries I know everyone recommends Trojans but I wanted to pass these along. I ended up getting 2 Duracell Procell SLIGC125 6V Batteries from batteries plus at $139.99 a piece. SLIGC125 6V Battery - TXT Shuttle 2 (Electric) - TXT Shuttle 2 (Electric) - E-Z-GO - Golf Cart - Batteries Plus
The specs of the Duracell at235AH and a RC488.00 appear to compare nicely to Trojan T105 and it offers a 12 month warranty.
I will pass this along from the manager of my local BP. He claims he has a major contract here in Milwaukee with a equipment company who handles large floor scrubbers, pallet jacks etc. Most machines come with a Trojan T105. Once a Trojan eventually dies they replace them though BP with the Duracell. Manager claims he has had very good luck with this Duracell 125 model and sells a ton of them. He says reliability has been great evidenced by the company beating the hell out of the machines.
Also that $139.99 was not the list price but the manager discounted them no problem as he should given the BP mark up. I think the price was fair given the specs but only time will tell.