Towing distance is the number that matters
Some plans tow to the nearest qualified repair facility, some to a stated mileage, and some to a dollar amount. Between Sahuarita and the places you might actually want the car taken, those three produce very different outcomes, and nobody checks until they are at the roadside.
Usage is often capped per year
Plans commonly limit the number of service calls in a policy period. A household with an unreliable second car can exhaust it, and exceeding the cap is paid at full roadside rates.
Frequent use can be noticed
Repeated roadside claims are recorded like any other service and some carriers treat a pattern of them unfavorably at renewal. It is not a reason to avoid using it when you need it; it is a reason not to treat it as free.