Just a quick update here, even though it's probably not relevant to anybody else (but I want to keep this party rolling) -
I've gone ahead and paid the night that I got my VIN, and just uploaded my proof of insurance (as of early June) to the site, so all my steps are complete.
I spoke to my Sales/Delivery Advisor and he said that my vehicle was in Sacramento as of the 28th "being checked out" and is probably leaving to the SLC distribution center within a day or two, and then being picked up by a 3rd party carrier there to bring all the way up to Montana.
I have no estimated timeline showing (haven't had one since I got my VIN), but the advisor said it probably would be about a week for the truck to go from Sacramento to SLC, and then a few days at least for the carrier to go from SLC to Montana. That trip from Sac to SLC sounds oddly long, but I know nothing about how vehicles are transported, and if it's making multiple stops, etc... At this point I'm just happy that this whole process seems to have gone faster than I would've predicted. I'm sure it doesn't hurt that I'm considered a "far" delivery, as it sounds like those are prioritized.
Will update once I receive on how this carrier direct process goes
and I'll also confirm whether or not my passenger will be comfortable in the lumbar area.