Roughly 75% of loading only moves can be accomplished most efficiently with just 2 professional movers. However, there are at least two circumstances that would require you to hire 3-4 movers, and these are listed below. First, whenever you have any items that weigh over 250 pounds, then I would recommend hiring 4 movers so that 2 guys can be on each side of the heavier items. This would include the following items: a pool table, a piano, a safe, a vanity, a treadmill, an elliptical, a hot tub or a fish tank. Second, if you have any expensive items that are oversized, then it’s most prudent to err on the safe side by hiring 4 movers to ensure the item doesn’t get damaged.