In many large scale grows they do stack pallet racks up for a vertical-like grow. A true vertical grow doesn't use horizontal platforms. So this is more like stacking.
Yes thats correct. I actually have access to these types of units made for large scale industrial grow ops that are on rails and can be moved by one person by turning a wheel. Several companies make them and i'm actually working with one of them. I offer a more consumer friendly version that can be upgraded until you need something of that size.