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Not sure I agree that it takes more than 2. My neighbor and I lifted my lwb bed off with no problems. Granted he's about 6' 6" and weighs maybe 230, but I'm 64 years old so make up for him.
Having said that, I don't want anyone to get hurt, so 4 would make it easy. Or, 3, with one of them being like my neighbor, would be duck soup.