Erik, the platforms are homemade. I made the one under the dryer more than 20 years ago to support a stacked set of a Miele washer and the dryer in the picture. My initial idea was to leave the platform standing on it's wheels but this proved to be too unstable and so I added the wooden supports. In that configuration I had no problems till the washer died. When I bought a new washer earlier this year I made a second platform. As the wooden supports were already planned here from the beginning I placed the wheels such that the supports would fit better under the platform. When I want to move the machines around, I use a small jack to lift the platform, remove the supports and lower the platform on it's wheels.

