Can you post pictures of the areas that are missing items? And I think you need to install what is called a brake controller. Your trailer already has electric brakes but your car needs to regulate those brakes.
like this one
https://www.amazon.ca/Tekonsha-90195...s%2C101&sr=8-9
And welcome to the JOF. One of our favorite camping areas is La Verendrye.
My anglais keyboard lacks the accent marks for French names I am sorry. Most of us don't have any skills in the French Language so your English is commendable.
I took French in HS and promptly went to Montreal and needed a restroom. I asked a store proprietor if there was a "salle de bain" available.. She had the most incredible expression.. Why on earth would a stranger want to come to a store to take a bath?
Well that was what I learned in high school.