The Provider ST225/75R15 Radial Tire w 15" Viking Aluminum Wheel # A225R6FPS does come ready to put on your trailer, though they do not come balanced like you would see with an automotive tire.
Although you can have them balanced if you like, it is not necessary because a trailer is tracking behind a vehicle so they are going to have a much rougher, bouncier ride and balancing trailer tires would not be noticeable.
I've added a link to a video review of this tire and wheel combo for... view full answer...