Doug,
Maybe you could school the folks at Tiffin. I helped a co-worker remove the below
Sharp R1875 Convection Microwave from his Phaeton. It died and he bought an identical replacement unit at Home Depot. Tiffin only used the 2 mounting points on the top of the microwave's case in the upper cabinet. No additional screws were added to the top of the case by Tiffin.
When my
Sharp R820BK died I opted to chase down the internal fuse instead of wholesale replacement like my co-worker did. Mine had a blown internal fuse, plus I did not want to give it up because it's a grilling convection microwave. The R1875 doesn't grill.
