I find 800/miles per day to be on the edge of believability. That's nearly 13.5/hrs of drive time at a reasonably calculated 60 mph. (For those of you not familiar with estimating travel times -- drive time -- ask any trucker at what speed he figures; I was taught to use 50 mph). Not exactly the safe, "professional" driver on the road, this guy.
One million miles is nearly 90,000 miles/year if he put that truck into service in 1994 ('95 model).
90,000-miles/year is also about 1750/wk, or, at the indicated "every four workdays" it sounds like he ran this route twice-weekly and changed at the end of every other week; or, 3500-miles.
I agree with the above that some of the items on the vehicle not thought of, normally, ought to also be shown: worn-out seatbelts, broken seat cushions, sandblasted windshields, worn or corroded electrical terminations; fatigue on suspension/braking components, fatigued u-bolts, frames, bushings, etc, etc. I have strong doubts about the integrity of that vehicle, as even a Class 8 rig is thoroughly worn down after 750,000 miles and it is built for such work. No surprise that this is in GA, with no safety inspections.
All I see is a guy who risked the safety of the rest of every time he went to work,too mean to retire that vehicle at a decent interval, (as a depreciable capital expense).