As I read your parent's comment, my mind was drifting in the direction of your comment. Domino's is said to be working on such a thing, but more of warming rather than a cooking setup. The good pizza places I know use ovens that are ~500F. A couple issues: Is that feasible or safe in a vehicle? How about different distances to the delivery location resulting in overcooking/undercooking some pizzas?

I live a couple blocks from a pizza place. I order, wait 10 min, then turn on my oven, and then pick it up 10 min later.