When spawning on our server, the player is located on an island we've dubbed "Spawn Island" (Original name isn't it?). On this island is a series of platforms with pressure plates. Under the pressure plates are command blocks encapsulated in bedrock. The command blocks have a tp command to teleport anyone standing on the platform to their respective destinations. At the destination is a duplicate platform with the ccounterpart command block to teleport them back to the proper platform.
The system works well with one big problem we've found. If a player is riding a horse, the horse does not teleport and is left wandering around near the departing platform.
Is there a way to change the command to teleport a player as well as any horse they are riding (preferably staying on the horse if so)?