Airstream at least partially supports the factory overhead microwave from below with an appliance garage.
I guess they don't trust tying it into the overhead and wall.
The microwave is also in a cabinet much larger than itself and the metal surround is louvered above and below to allow plenty of cooling.
We wouldn't be without a gas oven, especially when boondocking. Would do without a MW first.
Also, as you can see, they paint the stove cover to match the countertop on at least some models.