Tan Katzkin kits (even for a quad cab) are easy to find and pretty cheap on eBay! I dont think anyone wants tan
Id consider it myself but Im not changing door panels too because I didnt want 3 colors in my truck (4 if you count whatever color they call the headliner).
I prefer the light gray, it will stay cooler in the sun. Plus my interior is already that color, so even if I get light gray leather for the main seating, leaving the jump seat light gray CLOTH at least still matches somewhat (plus how often is the jump seat open anyway?)
The full Katzkin kit (with 3 piece console parts for the jump seat) can be found pretty easily as well, so its just a matter of getting heated seats, even if they are just cloth, then adding the kit. Or finding just the right set of seats already in leather, preferably light gray and just leave the jump seat as-is.
The biggest issue, like you've seen when trying to sell them, is the quad cab. I guess no one bought them or crashed them or ever changed their interiors