Check out Youtube. Lots of inventive solutions there. Most involve a power-ventilated, sound insulated box. None that I saw were designed to be very portable. Some have even added automotive mufflers, but that's only half the battle; the motor makes quite a bit of its own noise.
Good luck!!
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-2018 Greyhawk 29MV
-2020 Jeep Wrangler Unlimited (JLU) (Primary Toad)
-1994 Jeep Wrangler YJ (Secondary Toad)
-2014 Jay Flight 28BHBE & Ram 2500 6.4L CC 4x4 (sold)
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