"Camping" means different things to different people...
My mother traveled all over the US for years in a van (the travel kind, not the RV kind). A microwave was her only kitchen. She eats very little, and chooses to spend her time exploring rather than cooking and washing dishes. She now has a Roadtrek, but I'd be willing to bet she's never lit the stove.
We, on the other hand, do more cooking at camp than at home, never with hookups, so no microwave for me, either.
I agree about asking EggCamper
whether the cabinets can support a microwave... but aren't they on an indefinite production hiatus? Is there a way to contact the owner?