Test kits are mobile, vaccines and bloodwork are mobile, basic diagnostic equipment is mobile. Most people do not need the vast majority of things a clinic contains; nothing you couldn't solve with a small refrigerable unit in a vehicle.

That being said, the downsides of travel time are so negative it's hard to see how they could be overcome.

> I can’t see how there would be any cost savings except if you dump equipment that would otherwise be available

Compared to an urgent care facility, they pretty clearly have to be doing that.