I am not 100% sure BUT what I’ve noticed is the last 8 and 7th digits of vin are
Mine NF2…..
1 in New Jersey N1……
1 at my selling dealer was N1……
All 2500 HD diesels and all seem to have been LT
Also have noticed with the N1 vins had heated seats and steering wheels with no credit on sticker and the 1 in Jersey I drove and heated seats and steering wheel worked
I and 4 other of my close friends are waiting all with last 8 of vin starting with “NF”
I too have traded in truck which was sold so basically have to wait
I’ve brought my findings to Chevrolet customer assistance and they have no answer waiting for a rep to reach out. Very very frustrating and i understand others have or waiting longer than I but thought I would share what I am finding out.