Very interesting, nice brochure, good post!
The brochure suggests publication sometime pre-'87 (when our Mk III was made, by Silverton in Marlboro, NJ) and whenever the 36 was introduced. My lousy memory thinks the 36s existed when our Mk III was built and they were usually gassers... Obviously the 40 wasn't a double-cabin version, so the aft-cabin models would have been the 36s, I guess... maybe the ones called the Nantucket.
Interesting the brochure doesn't appear to include photos of an actual (i.e., already-built) 30...
Interesting also there was apparently some overlap between the 34 and the Mk II; I had thought the Mk II was a clean replacement for the original, and also that the Mk III we had was a clean replacement for the MK II.
FWIW, the 30 diesel pictured is certainly green, but I'd have expected a Perkins or a DD 8.2T during that era... and our single diesel at the time was a green DD 8.2T.
-Chris