Eh... Delivering multiple cars over a short distance by loading them up on a flatbed or car hauler just doesn't make any sense. Tow trucks will always be more expensive than calling a taxi. Especially given that this is basically a textbook example of the travelling salesman problem. And I don't mean computing a route is hard, I just mean that in practice while there's overlap between destinations for a sparse set of e.g. 10 destinations spread evenly over some area around a hub it's not like being able to go between destinations directly makes it 10x shorter. Trucks are expensive to maintain and operate, much more so than a regular passenger car. Trucks also can't deliver as easily or to as many places as a person driving it. If someone lives down a dead end road that's extremely inconvenient for the truck whereas it's a non-issue for someone driving.
Car haulers don't make sense for sparse local deliveries.