This thread seems oddly familiar to me....I recall beck in '15, the Hellcat Challengers were low production, and some thought they would be a desired model. -Then they (FCA) flooded the market with them in 2016. No one I know of wants a '15 specifically because it was a low volume year. Even the few that had the rare sunroof or black hood options that were produced at the end of the '15 MY - they don't seem to command any more $$ than any other used '15 Hellcat. Heck, now to make things even worse, any Scat Pack can be ordered to look exactly like any Hellcat Challenger....same hood, wheels, brakes etc. - Just different fender emblems externally.
-FCA is still going to produce both the narrow bodied (or regular) RE Challenger HC's along with the Wide Bodied ones in 2020, with no big changes from the '19 models. I don't see the '19's (narrow or WB) as being sought after in the future myself.
-I used to think my '15 Jazz Blue HC would be desirable...it was the rarest color produced in '15. Turns out that It didn't command any more value than any other that year. -40 years from now?!? Don't matter to me since I'll most likely be long gone by then.