Mobile out of the trunk of my car. With a tent if I need one. I just hook up to their power and water. Still haven't did waterless on a clients car but will start soon.
I work out of my shop or my home, and at the homes of few very select clients with advance notice. No typical mobile as I'm not detailing anyone's car in their driveway or parking lots.
I'm mostly mobile these days. I do have agreements with two local shops to use their premises if needed.When going from mobile to fixed location lost half of my customers due to them being spoiled with at home service.