N.
Until you mentioned it, it never even occurred to me to tip movers. We've mostly used smaller companies where the owner is actually one of the movers so that may be why it never occurred to me before, or it may just be that I'm cheap and I figured the hundreds of dollars that I paid for a few hours of work was sufficient. But I've never tipped a mover, ever. I never even thought of feeding them like some of the people mentioned. We always have offered drinks of course, but our moves have always happened so fast (local short distances) that none of that ever seemed necessary. Of course now that I know some people do, I probably will tip in the future. Very good question! :-)