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They are all going to vary some by how the dealer set your car up based on suspension package, and age of shocks/tire height
The condition of the door hinges will play a part in the measurement too. Hinge pins and the hole in the hinges where the pins are located will wear causing extra droop.
If this is an open trailer, the left side fender should have a release so you can tip the fender out of the way. My Z has old suspension and cleared with no issues.
You could put some boards down on the trailer to pull on to if you have to. Could gain you an extra 1 1/2" or so.
This is what I'm probably going to do. It's a full Metal trailer so just worrying about it slipping and no the left side fender does not have a release.. Actually have never seen a trailer like that.. So many different brands