RubbermaidFastTrack Garage Organization All-in-One Rail & Hook Wall Hanging Kit, 8 Piece

This is a 5 piece kit but nowhere does is state what those 5 pieces are. What are they?

Will this system work if there is 24" in between studs? I am only wanting to hold up about 20 lbs, not the max of 1750.

Would this work to organize items in a horse trailer? I am wondering if the movement when driving will cause the hooks to slide around on the track?

Does the tool hanging kit ($63) come with two rails or one?