This is really neat, and I think it could work well for most basic maintenance work. I'm really curious about the logistics.
How do you handle catastrophic failures during a repair? For example, what happens when a rusty bolt head snaps off and now a component needs to be drilled and tapped? I've worked on my fair share of older cars that have lived their lives on salty New England roads, and this happens more often than you'd think. Does the car get towed to a repair garage in these cases?
I see wheel/tire mounting and balancing listed as a service. How does that work? Are you able to get the balancing machine into the service vehicle, or do you pick them up, leave the car on jack stands, and then bring them back balanced (probably disconcerting for the customer)?