Wow! I like the garden hose for the gas, but yes, probably shouldn't try this at home. Any particular reason for 60 gallons at once? Are you just trying to get ahead, or did you have an extra 120 lbs of grain you needed to get rid of? I thought doing 2 - 11 gallon batches in a day was feat, so I can't imagine 2 - 30 gallon batches. Anyways, good job on the massive brew day.