I really can't imagine that. So you save some driver time. They're usually idle before delivery already, there's no driver shortage, and drivers/delivery isn't expensive. So there's only a small amount to undercut. For the profit to become interesting, you'd need a massive volume, but then you'd be forced to maintain a large fleet of mobile ovens. There's no automated driving, so you'd need drivers anyway. You'd have to pay everything from their idle return time, including the increased energy consumption.

Back-of-the-napkin says no.