The 15" wheel I recommend for your boat trailer is the Americana Galvanized Steel Spoke Trailer Wheel # AM20534. This has a 6 on 5-1/2" bolt pattern like what you're needing and we actually have a review from a customer talking about how this was the only one they found to work with disc brakes.
Attached is a review video as well as a photo of the review for you to check out. view full answer...
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