Also there is no difference in an RV microwave and a home microwave - EXCEPT!! - how the warm/moist air is vented out of the unit. I would tend to want to order one from just about any old RV dealer, maybe one online, to get one that vents correctly. It may even be available with new trim for a really clean install.
Some folks believe RV microwaves are made to withstand road vibrations as well. Maybe. But I can't prove that. I can prove the part about venting.
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"RVing and Amateur Radio served up on the same plate"
2008 (or is it 2009?) Rockwood 8280SS - 2007 F-150
Lot's of mostly Kenwood radios