If you stack your dryer be prepared to unstack it for repairs. The technicians that repair them are not moving men. Some appliance companies may have the equipment to move them. However, it will cost you to do that, If the machine is inaccessible it may result in reschedules. To many people make their machine unable to be serviced because all the hook ups are in the back and you can't get to them. Also, if something happens and you need to turn the water off or unplug them you are in trouble if you can't get to the shutoffs. I have seen to many floods and dryer fires to trust not being able to move the machine.