On many late model vehicles I take my time and make one side visually correct. If it looks good it is good.
Then I take out the tape and measure the visually correct install for successive sides/vehicles.
With so many cars devoid of any straight lines it's what works best for me. Clients are always happy.
I heard Justin Pate, the wrap guru, once say that the bottom line of the door never lies. I'm not agreeing necessarily, but so far it's worked 100% of the time for my experiences