When ranching I excelled at backing up gooseneck stock trailers. Even other cowboys would have me back theirs up to corral gates.
Yep. I remember those days.
Then I got another bumper pull, after not having one for forty years. I could not get it. I fumbled around for three years.
I had a few kind of free days, took my trailer out to a pasture and backed up until I was exhausted.
The biggest thing I had to change was not over steering. My BP is a 3-horse slant. I was used to stock trailers that would hold 10-12 horses, tied.
Practice, patience, a bit of cussing, stomping, hitting the dashboard, practice, patience.