Never heard of them before specifically , but a lot of shops did limited edition custom stuff like that back then. My Dad has a 78 Camaro "Cascade Edition", one of about 100 or so, that sort of falls into the same category, though it is basically a paint pattern more than anything else.
I have heard of a particular stepside bed design that might be related, usually called a star side. It is hard to describe but basically it is a stepside with several molded in lines radiating out from the fender into the rest of the bed. There is a picture of one somewhere in the gallery here I think.
EDIT: found the link here it is.
http://www.luvtruck.com/Gallery/MikeBai ... index.html
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95 Isuzu Trooper Daily Driver
86 Isuzu Trooper reliable backup
77 LUV 2wd stock beltway blaster (resting)
79 4x4 LUV project: 2.6L, 5spd, 31s (eventually)
MEPR: Man, my 4x4 makes all other LUVs look good
