You can use 1 cross bar and under options select to use hotbars 2-9.

I have the cross hot bar and the vertical bar 9 set to share across all classes on the right side of the screen. Use it for food, mounts, pots with a mouse.

Set them to invisible for greater customisation. E.g. Just use 4 slots so you can fit without overlap.

Can't get on the game now or I would post a screen.

This is on PC. Not sure if you have the same options on PS3