I'm still trying to find pics of that factory Cummins-equipped early-'90s Ramcharger I saw at the Mopar Nationals. If it was a fake, he went whole-hog right down to the window sticker. It was white with a red interior, and took place in the burnout competition behind our hotel. My friend Danny was particularly interested in it, which is how we got to see the original window sticker, paperwork, etc. I want to say the truck was a '91. According to the owner, less than 10 were built. I can't remember the exact number, but it may have been as low as 2.
This falls into the "I know what I saw" category, along with the '71 4-speed SS454 Monte Carlo for sale on a lot on Hwy 78 when I lived in Atlanta, which Chevy enthusiasts have exasperatingly told me could not, and does not, exist... even though the option sheets showed a heavy-duty clutch option for the LS6 engine.