Hunter didnt build the trailer, and likely didnt even spec it. Most often the dealer/buyer makes that choice. Also, an owner may upgrade the trailer.
What is on the trailer now? If your unsure, drive the trailer over to a boat/trailer/tire center, one of them should be able to figure out what you need.
Alternatively, Walmart, Tractor Supply, etc., also have mounted tires and wheels for trailers. You should be able to find one of them that would work.