I use the All Dolly and built a platform to sit on top of it. Then I slide the dryer onto the platform and roll it out of the way. Works in most situations. Very easy to create. Usually done as a one man job but I charge extra if the dryer is stacked and has to be removed to service the washer.
One time, the customer's dryer was stacked inside a closet in a very tight bathroom set up and no way to use the Alldolly so I had the customer find someone to remove the dryer before i would go out and repair the washer. Very rare but I wasn't about to break my back for that job.