Make sure your electric service is up to the anticipated load. It is surprisingly inexpensive to upgrade.
Great advice on here, thanks! I did call the power company and asked them about putting a dedicated service on the new structure - they said that the County probably wouldn't allow it since it will be attached to the existing structure...which is debatable since my shop is attached only by a shared roof over unlivable carport / breezeway...but they're running the numbers on my existing service to see if it will support the additional heatpumps, RV plug, welder, etc.
