Practice make perfect. I agree with one of the comments above. It is not bragging to say that I can easily back our 38 ft Monty (onto your toe if you stand still".
We have owned 5 RV's, 4 have been 5th Wheel models, over the past 50 years. I also regularly back ranch trailers, horse, stock, flatbed, etc., plus our semi trucks with 53 ft trailers.
I also agree that it is easier to back a 5th Wheel (or goose neck hitch) trailer than a bumper pull, although we have both types on the ranch. I just have to be a little more careful when backing a bumper pull.
Practice over time and you will become proficient.