I'd prefer to have the moving company pay the movers a living wage such that a tip would be unnecessary and politely refused.
Clearly, you have no idea of how the moving industry works. Everybody's a contractor of a contractor of a franchisee. The person who picks up your stuff is not always the person who delivers it.
When I move (frequently), I make sure to tip each person packing my stuff $50, each person loading my stuff $50, and the driver $100 for < 1,000 miles, or $200 > 2,000 miles.
Lifting and carrying and handling other people's prized possessions isn't an easy job. This is how I show appreciation when the job is done well.