[GORDON HUMMEL]

The Amazon price is much better, but neither will come with the vent kit. I went to the sears site & 67903 is not a current model. They have a 67909 & list a built in kit for but it is only the front bezel? My original unit was a Amana but absolutely identical. As I recall it took me a while to get the vent kit, as the Amana at that time was discontinued.
The vent kit is MANDATORY......in my opinion!
I guess if you put in where the old one was & cut some venting holes in the bottom & then ran the roof vent fan above it, it might work.
These trim kits are like the razor blade business; they give you the microwave & make their money on the install kit.
If you look at units that are wall mounted for over the stove use, they are more expensive, smaller size. Not sure if I would hang it on any motorhome wall!
I'm going up the hill later to where my old amana is & see if I saved the vent kit mounting instructions & maybe some pictures.