Oh now that is one envious "side storage compartment" for sure.
We all would like something like that, and my 2012 2350 is not even built yet!
Evidently the later 2350 layouts must put the water tank on the far end now, limiting the available depth to 18". I think I read somewhere here that that was done for load balance to get more weight on the axial. Probably for better NASCAR handling?