Enclosed Stackable Washer/Dryer Access for Servicing

I was just reading a post about the Dewalt construction jack and thought I'd ask the following in this subreddit.

I had a stackable washer/dryer installed in a "cubby" type floor to ceiling buildout when we renovated our bathroom. Only front is visible with some but limited access to the back through a removable panel I had installed on the backside, and I fear the day when the stack will need to be pulled out for some sort of service, either to the electrical, gas line or plumbing in the back, or washer/dryer themselves. In retrospect I should have had some type of wheels or rolling platform installed. The Dewalt would work on the front (assuming it can handle the weight), but how would the back be pulled out given the weight and highly limited access from the sides and back? I'd like to get the stack on rollers/wheels.