2020 Toyota Tundra — what should a real pre-purchase inspection include?

Hard-won lesson from my last deal: A written buyer’s order on the 2020 Toyota Tundra is worth more than any verbal “we’ll make it work.” If they balk, that's your answer. On “what should a real pre-purchase inspection include,” that was the fork that mattered for me. This is from a 2020 Toyota Tundra in Texas with 113,500 miles. Time, temperature, and whether it's in gear are the notes that actually help a shop. If GAP is bundled I'm making them unbundle it.