I would put in a regular panel, feed it with a 60 amp breaker. Yes I know a regular panel has a 100 amp main. That would still give you a disconnect for safety and if it’s a 60 amp circuit you don’t have to use such a heavy feed cable. Use aluminum in your feed as it’s much cheaper than copper, you just have to upsize the conductor. Remember a 50 amp circuit has 2 hots and a 30 just 1. I did my garage like that about 30 years ago, never regretted it that way.
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