I do think VINs are assigned sequentially. However, yours being 602007 vs mine 569600 (forget last 2 digits) does NOT mean that there are 3000+ Tungstens between ours. It just means that there were 3000+ total trucks between ours.
Of those 3000, many were likely Big Horn, for example, and have been made/shipped/sold.
There are a small number of Tungstens in there, and even a smaller number of sold order Tungstens (which take priority).
It reality, there may be fewer than 100 Tungstens before yours.