You're putting me and my OCD to shame with your clean layout and organization! (you've even got all the plugs labelled) That must've been a beast to move - even when empty! Do you have a separate RO ATO and saltwater connection on that back wall?
Thanks blaxsun, hopefully its clear I sat and looked at the area under the stand and behind the tank for awhile to logically lay out everything and ensure I can swap out pumps and equipment.
Moving the tank, although heavy as the stand is steel and wood wrapped - was not so bad with the leveling feet - I slid a folded paper towel under each foot and you can simply slide it into place nicely. The RO and ATO, as well as the plumping for waste water / water changes are behind the tank in the floor. Just under the tank is the Salt / RODI tanks and ATO. (I have leak sensors too)
If you noticed the Red PVC - That is my waste water manifold. I drain my Skimmate, Trident Test water and can drain my QT Tank simply and start over each month by turning a few valves.