Hi donkris.
As the others have already answered, to have electric brakes on your trailer function, you will need a controller installed in your new TV...
I would say "DEFINITELY" to having trailer brakes functioning in your TT... Without brakes on the trailer, you could get in trouble!! Remember, pulling the trailer is just one part of the Towing Puzzle...
being able to stop safely and control the TT is a huge safety factor.
Good luck...