Rear most storage area size starboard and port

[PaulyB]

Does anyone know how wide the storage area is in the rear most area of the port and starboard sides of an 08 230 boat, I am considering putting a battery or two on the starboard side back there and putting two on the port side. I am looking at buying a battery roll out tray to place the batteries in, just need to know what size will fit. Im looking to see if I can find a tray that will fit batteries side by side and allow it to slide forward. Something like one of these setups for those who are wondering. http://www.international-powerstroke-bus-parts.com/products.php?cat=Battery+trays