As someone who works in Ag and has seen good and terrible maintenance of fleet trucks, I can say with confidence, don’t over think it. Just drive.
I used to think we need to pamper our cars and never start them unless they can be fully warmed up. That went out the window when I saw abused trucks last as long as pampered trucks. The pampered ones looked better and did seem to run a bit better, but they all made it to the 150k miles we drove them.
I’ve seen trucks where you can barly recognize what brand they were from abuse still running fine with 180k miles on them.
Let your wife enjoy her schedule and change the oil more frequently for peace of mind.