Mobile service and roadside assistance are not the same
Both are here, and they answer opposite problems.
Mobile service is planned. Tires changed at your yard or site, at a time you chose, usually across several units in one visit. A depot full of trailers is the case it exists for.
Roadside assistance is unplanned. A unit has stopped somewhere it should not be and a technician comes to it.
If you are deciding which to ask for: did you choose the time, or did the tire?

