Can we get some clarification for the mount equipment?

[Caelia-uldaman (Caelia)]

As described during the stream yesterday.

@Pocketmage-ghostlands

Hang on I found it! Liveblog of the Patch 8.2 Rise of Azshara Content Preview Stream At about 00:58:00 he talks about the mount equipment.

This Equipment slot is on your character and once you apply a piece of mount equipment to it all your mounts will receive this benefit.

So you would need to equip an appropriate item on each character.