GW2v2MountType 
  constructor(id: GW2MountTypeId, name: String, defaultSkin: GW2MountSkinId, skins: List<GW2MountSkinId>, skills: List<GW2v2MountType.Skill>)
Parameters
id
the mount type's ID
name
the mount type's name
defaultSkin 
the ID of the mount type's default skin
skins
the IDs of the skins available for the mount type
skills
the mount type's skills