My trad hood is water proof, no issues also on the front. Mine is a 2003, which I bought as a used car, so I´m not sure if the "rubber tube" for sealing the front window on the upper part next to the pins is standard or was added lateron as an improvement.
Last year I had dinner with a customer and just had the tonneau put on the car. An unexpected rain didn´t even allow me to go out of the building and cover the Mog with the storm cover to protect it. So when the rain was over I was extremly concerned how much water I would find inside - Not one drop, so also the tonneau is fully waterproof.
Gerhard - are you sure that wasn't just a dream you had?
