How to move stacked washer/dryer from closet
Furniture movers are glides that slip under the feet of furniture or appliances to allow then to slide. 



The hard plastic slides on rugs and the fuzzy covers slide on hard floors.

You can slip a pair of these under the front of your unit and, if you can, under the back legs as well. If not, tilt the unit slightly forward and pull. This is best done with two people.

These stackables are usually placed one at a time, but the upper unit clips into the lower fairly firmly. There is often a screw connection.  If there is not room to get behind to disconnect the upper, better to pull them out as a unit. Almost always the lines (water, power, gas, vent) are long enough to get the unit free of the closet and to then reach behind it, but check as you go, using a mirror if need be.