When my microwave quit I looked around and found a floor demo at Camping World that fit the front grill plate. Took it to a local RV shop and had them install it. One savings balanced the install cost.
The new one was a microwave/convection oven. Never did figure out the convection part.
Today, in my new to me rig (normal microwave), I travel with an air fryer. It can do what one of those “ovens” can and more. I happen to like French fries with brats or dogs. Easy to do with an air fryer. Minimum cleanup is a plus. Even done fresh breaded pork chops in it. Baked potato not a problem. Nice and crispy on the surface.
Just another thought.