I cut my tractor trailer driving teeth driving in the City of Miami, backing up against or "bumping docks" literally dozens of times a day. I am not bragging here, but I can put that 102" wide truck into a 104" wide space, no problem. And I've done it before. It is true that many OTR drivers just don't get that much practice backing up because they mostly drive..well...forward. They might back into a dock once every 2 days or so but I have done it probably thousands of times and for a while, up to 25 times a day.
Just tell me where you want the truck. If it will fit, I'll put it there. Of course, with Car Haul, I don't back into docks at all. I need room behind me to load and unload and the unit has to be perfectly straight in order to have the tractor decks line up with the trailer properly.
When I was driving on the Indy Car circuit back in the 1990's, the company I drove for had offices at the Detroit Diesel plant in Redford, MI. Our parking spot for the truck was in a courtyard sort of area in between their Engineering department Dyno halls. In order to back in, I had to pull into another courtyard 150 yards further up the edge of the plant, back out and down an alley then left into our courtyard. The lane into the yard was about 1 and a half times the width of the trailer and then opened up. They wanted me to park to one side of the wide spot and I prided myself on being able to do the entire maneuver in one shot, without any corrections by pulling forward.
Here's the exact courtyard I am talking about. The crosshair is centered on where I had to back into. I would drive along the north side of the building and pull into the courtyard to the left of the center of that shot and back up down and into that alley, under the walkway you can see, into the space and place the truck and trailer alongside the west edge. The Wikimapia shot does indicate that Detroit Diesel has done some building expansion in that area, as the courtyard does not appear to be long enough to hold a 75' long truck, but back in 1989-1993, that's where I parked the 18 wheeler
This is the truck I did that with, probably 40 times a year;