A:Answer As a owner of both, the dryer and washer, I would not recommend stacking these products, as sturdy as they look, the outside is thin sheet metal.
But, I have seen the Dryer stacked on the Washer many times at shops and friends places.
If you must stack, I'd put a wood piece between the 2 appliances for better distribution of weight. Just my 2 cents, fro man engineer's mind !