A weight distributing hitch transfers weight away from the rear axle. Some is transfered to the front axle of the vehicle and some to the trailer axles. You were told right, wsanchez, they are safer.

I can't pretend to be inside their heads at BMWNA, but here's a theorem: IF they rated it to pull 6K AND the only way to pull a 6K trailer is with brakes, THEN a surge brake equipped trailer is the only option left. This negates the use of a weight distributing hitch. Which seems to be the way they do it in Europe.

Which wire(s) did they have to run up to the front?