I sold a number of different vehicles in the last 50 odd years, and nobody has ever asked me for my service records. As far as oil changes you have to decide that one the way you have driven the truck, and how the oil appears when its time to be replaced. I sent my oil out to be analyzed after doing 15k mile oil changes with mobil 1 5w30 once it registered 100k miles on the odo, and another 100k there after with my 2001 tunda 4.7. The sheets came back with nearly the same info after 200k miles.....nothing unusual. That engine still runs great today with another owner. I wish i could say the same for the body now. Mr rust is winning.
The way i see it for my driving usage 10k is very safe. I don't do a lot of towing, especially heavy towing, or spend a lot of time on dusty dirt roads. No need to use up more of our resources if i don't have to.