Bottom line is that there are many products out there to use and about 1000x as many individual scenarios as products to use.
If a person has the mechanical aptitude/education/experience and horse sense, a lot of things can be done safely that others would not be able to do safely for lack of the above personal qualities.
Being aware of how you trailer tows, backs up, where the pinch points are falls mostly in the horse sense category and if you don’t check how tight you can turn your trailer in a controlled situation, eventually you’ll find out another way.
