We experienced a frozen black tank while wintering in Colorado and could not dump. Was able to finally dump doing the same things you describe plus several dumps of boiling water thru the toilet, and opening up the belly and aiming a portable heater on the tank, and a hairdryer directly at the dump valve itself. Since we were in two feet of snow it was a miserable experience and one I would not want to repeat.
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Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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