[skyking]

I did not find training stated.
Not all of us were born backing a trailer and hauling a load, as did you and I.
That is my main emphasis. All the fancy equipment on the most modern trailer is worthless with out that. IF you are within your hitch requirements of the tow vehicle, and have a properly loaded trailer the WDH is a great convenience but not a requirement for safe operation.
Note the hitch requirement statement. Most rigs come with a standard class 3 with 500 tongue/5000 maximum trailer weight WITHOUT WDH.
So following your class 3 standard hitch requirements, you will have a WDH with a typical travel or car trailer.