There are several current & retired professional truck drivers that are members of this forum.
Very seldom would they open a door to assist with backing up.
Those tanker drivers that deliver fuel to gas stations, have the worst job ever.
confined area, flammable material & worst of all, stupid people that just want to fill up their vehicles.
Even with those huge round mirrors that are attached to the bottom of the regular mirror mounts, they can't see & watch everything.
Sometimes they have to get out of the seat, or even the cab to see the what, who, & where is the next step to get lined up with the tanks & the tank covers.
I have to open my door, to position my Ram exactly in its parking spot.
The city says that no part of my vehicle can be parked on the city sidewalk.
I can't block the sidewalk going into the apartment complex.
I can't block the neighbors parking spot
So i have about a 6 inch square that my front tire must be in
so i have a cement line that my drivers door lines up with, when i am parked correctly
If you notice the cement line with the grass growing in it, one side is my drive way, the other belongs to the City.
The cement line below my rear bumper is the limit line for the beginning of the sidewalk into the complex.
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I can't see those cement lines, without opening my door, i am too short to lean my head out through the window
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Your backup camera should provide you the perfect shot for the rear bumper "line" I can back my truck right to the end of the curb so that there is "basically" no over hang on the the side walk.