Thanks to another member on here I was able to run down a letter from Isuzu validating Pearl's pedigree! Unfortunately it's only a copy but it's a cool bit of history to know about my VX. (It would be really cool to be able to find the original if it still exists).

Note - I also researched the two names on the letter; R.J. Kenney is now with Hyundai as the National Sales Manager and Jeff Baca looks to still be at what used to be Denver Isuzu.