Thank you for all of the great information and insights, everyone. I arrived at the dealership the morning of Christmas Eve and went straight to the service bay where they had topped off the fluids and changed the oil, so I could hear the engine turn over cold. It started no problem and I proceeded to take it on an hour-long test drive, cycling through all modes, checking all buttons and functionality, etc.
Mechanically, the car performed beautifully. No odd noises, warmed up to the right temps and was drama-free. Cosmetically, there were some things that were not visible in the photos they had sent me, such as a couple minor door dings and small spots on the seats. The rear wiper was also broken and needed to be replaced. Aside from these minor imperfections, the truck was mint.
After discussing these issues with the dealer, they replaced the rear wiper from a donor truck on the spot and lopped off another $1250 from the price due to the cosmetic issues. Knowing I had come from CA, they really didn't want the deal to fall through at the last minute. I ended up paying $16250 before taxes, title, fees, etc.
Prior to purchase, I had also tracked down the shop that maintained the vehicle in Los Alamos (third party, non government), and they were adamant that the Los Alamos National Labs vehicles were extremely well--and regularly--maintained. I've since driven the truck over 2k miles from AZ to my current location in TN without a single issue, noise, rattle, vibration, or oddity.
Regarding fluids: I've received a mix bag of information from the half-dozen or so shops I've spoken to. Some say to replace all fluids, others say replace some, others yet say it's not necessary until you hit 100k miles. I'm going to invest early and have them done--I got a deal on the truck and I'd rather run with the peace of mind of fresh fluids than save the $500 or so bucks it'll ultimately cost me. I also went ahead and replaced all four tires, it was running two different sets (one relatively new Hankook and one no-name Walmart brand) and being a performance car guy (I've only ever owned sports cars prior to this) the importance of tires is near or at the top of my list. So $650 bucks for a fresh set of Cooper Evolution H/Ts, a detail, and soon to be fluids change and I feel like I'm driving a new truck. There is an enjoyment and fun of driving a tall, commanding, smooth, and quiet vehicle that I had never experienced before. Let's say that for a daily driver and utility vehicle, I am totally converted.
Last but not least, I've been considering taking the truck to Ziebert when I have the time to have them perform a de-rust process they offer, alongside an undercoat to prevent any further rusting. Looking at the truck in person, it really is only surface level and I'm not too worried to be honest.
Here are some pictures I've taken so far:
