At three floors up if you have much stuff, say anything beyond a one bedroom, I'd say so.
Maybe $10 per guy for a two bedroom, $20 for a three bedroom etc.
I've heard it's customary to give the tip to the head guy with the indication that it is the tip for the crew and he distributes it to the other helpers.
I suppose a cold 30 pack, and muffalettas or Jersey Mikes or Italian Beefs all around might go over well too.