Look at the nose weight your kia can take, probably max 100kg, consider your trailer at 1000kg, wheels right at the back, so getting on for 50% of that on the towing eye of the trailer.
So you are overloaded, un braked, brakes are required for car trailers if 750KG or more. Hitches incompatible--ring on an agricultural trailer is not compatible with the jaw hitches you get to suit cars.
You will almost certainly find your insurance only covers ball type hitches...but then they will have walked away because you were unbraked, and overloaded already.
You must not exceed 20mph (even if all the rest was sorted) as the trailer has no suspension...in practice youll find the trailer starts bouncing uncontrollably.....I know because ive done it.
Pay a haulier-