Spawner Randomize [MinecartRideable]

/setblock ~ ~1 ~ minecraft:mob_spawner 0 replace {EntityId:XPOrb,SpawnCount:1,SpawnRange:1,Delay:0,MinSpawnDelay:20,MaxSpawnDelay:20,MaxNearbyEntities:32000,RequiredPlayerRange:6,SpawnData:{Pos:[0,-10,0],Age:5999},SpawnPotentials:[{Type:MinecartRideable,Weight:1,Properties:{Pos:[685.5,57.1,516.5]}},{Type:MinecartRideable,Weight:1,Properties:{Pos:[687.5,57.1,516.5]}},{Type:MinecartRideable,Weight:1,Properties:{Pos:[691.5,57.1,516.5]}},{Type:MinecartRideable,Weight:1,Properties:{Pos:[693.5,57.1,516.5]}}]}

/setblock ~ ~1 ~ minecraft:mob_spawner 0 replace {
	EntityId:XPOrb,
	SpawnCount:1,
	SpawnRange:1,
	Delay:0,
	MinSpawnDelay:20,
	MaxSpawnDelay:20,
	MaxNearbyEntities:32000,
	RequiredPlayerRange:6,
	SpawnData:{
		Pos:[
			0,
			-10,
			0
		],
		Age:5999
	},
	SpawnPotentials:[
		{
			Type:MinecartRideable,
			Weight:1,
			Properties:{
				Pos:[
					685.5,
					57.1,
					516.5
				]
			}
		},
		{
			Type:MinecartRideable,
			Weight:1,
			Properties:{
				Pos:[
					687.5,
					57.1,
					516.5
				]
			}
		},
		{
			Type:MinecartRideable,
			Weight:1,
			Properties:{
				Pos:[
					691.5,
					57.1,
					516.5
				]
			}
		},
		{
			Type:MinecartRideable,
			Weight:1,
			Properties:{
				Pos:[
					693.5,
					57.1,
					516.5
				]
			}
		}
	]
}

/setblock ~ ~2 ~-1 minecraft:air 0 replace
/kill @e[type=MinecartRideable]