Docks vary. Some look like 10,000 birds have been robbing the pads of their foam rubber for their nests, and others look like high school welding projects.
I'm sorry, that sucks... unfortunately the company can be strict about that. I know a pkg car driver who tried to go to feeders (the UPS tractor-trailer operation) and was DQed over backing. He had one side of the trailer about 2 inches off the dock bumper. Meanwhile in my industrial area dockworkers sometimes don't blink if a driver leaves a 1 foot gap on one side of the trailer LOL. And in fairness, most of the docks/yards on my route weren't designed for 53 foot trailers.
There are days when I get my 1000 with a slightly-crooked back bumper flush at every single dock. Other days I'm off by a couple inches at several docks.
Wtf is p1000 ? Sorry but I’ve driven dang near all the them that don’t require a cdl. usually it’s 5 -7 cube, 10-12 cubes, or 24’ furniture truck. I don’t think I’ve ever heard anybody at ups use that terminology . My first road test was in a 10 cube stick shift .