fridge uses way too much power when operating on 12 VDC. I don't think most solar
installations could keep up. You are way better off using a 12 VDC compressor type fridge.
While there is additional room in the kitchen for a larger width, and height, there is no more depth.
The dimensions I have for an RM24 are: 22-3/8" x 19-3/8", 19-7/8" (h x w x d)
I would have thought that a 1975 Trillium
1300 would have had an RM211: 22-11/16" x 19-5/8" x 17-5/8"
These dimensions come from this chart: