I always liked to reference these videos to go over different backing situations. These are for a big rig simulator game, but I like the birds eye view they give you, the instructions they give, and little tips too. Even though as stated above by CaptnJohn, a big rig can be easier to back in but this helped me when I bought my first 5th wheel. Good luck!
https://youtu.be/Kc5hobnRYI4
https://youtu.be/Ivhp9rJeINs