Ok here's how is was explained to me. When you order a truck it is ordered as a sold order...I think its 99 priority which I believe is the highest. At that time they are assigning it a VIN it is sequenced on the line....AKA "Production line" its one continuous line for that model year (so think linear). On that line there are batches (buckets) of trims and options that are grouped on the line (maybe 300-500 at a time). Since the truck is sold and is a priority they do all they can do to fit you in line closest to production (front of the line). Based on date ordered usually goes first but not always another sold order can jump ahead of an earlier sold order based on many things i.e. usually parts, etc... There are many factors the first being are you a D1 (do they have all the parts present to build your truck) this is most important. If they don't they try to guess when all parts will be available (usually its a pretty accurate guess based on previous history). Then they sequence you and assign you a VIN and sometimes assign you a build date and a ship date....if the line is currently moving....in this case it isn't and doesn't currently start up until 9 August 2021. When it comes time in line for your truck to be build if ALL parts (usually the options you chose didn't arrive like they thought they would) and aren't available they move you back in line (into the next batch that fits your trim/options) build that truck that was going to be yours with out those options and it gets a different VIN and it sits on a dealer's lot. This is why sometimes you see a status change from D to D1 and then back to D...meaning all the parts didn't arrive. like they thought they would. The actual VIN like the guy that has the "127" yes that is very low are usually built first....but often a higher number VIN can be built sooner then the lower number VIN ALL depending on where it fits in the production line with the batches/buckets of trims...... and do they have the parts on hand. I hope this all makes sense. There are too many variables that come into play that effect this process.....there's really no true rhyme or reason and much of it depends on luck.....is why most trucks are 6 to 10 weeks but yet once in a while on the timing a truck is ordered, built, shipped and delivered in less than 4 weeks and others take 14 -16 weeks. or even longer. With the chip shortage it makes the guessing game even that much harder as to how quick your truck will arrive.