*hit happens with cars, new or old be it a mechanical problem or a simple tire failure. You should read the roadside assistance contract to the letter.
They likely only have to tow it to a Ford dealership/mechanic. They are not taxis. That is why your son should have cash for his own cab, use his credit card or withdraw money from his line of credit to pay for a cab.
If he broke down late at night, no rental cars will be available anyway.
He's an adult not a baby, he should be able to take care of himself.