According to the patch notes we can now build a level 6 aetherial wheel stand via the company workshop. The patch notes state:
"A metal stand upon which aetherial wheels are placed and spun to charge. Holds three grade 1, two grade 2, and one grade 3 wheel.
* One stand per estate only."

Are people genuinely getting that much use out of the grade 1 buffs? I would have thought it would add another grade 3 wheel at this point. They already take 70 hours to complete charging.