Random mount macro?

Just hit rank 11 this week and was wondering if there was a macro that I could make to pick a random one of my epic mounts each time I mount with one button?

I know there are macros that use ZHC / TOEP on casts and stuff but those are equipped items. Was wondering if there was a way to maybe set the macro to get a certain spot in my bag and randomly use one of them?

Thanks for any help in advance.