I've also heard that the "Chicken Tax" on German Trucks is still in effect.
I brought an '88 crew cab back from Canada, and had heard about the 25%
duty on the crew cab, but that it doesn't always get applied.  My experiece
was that they listen to what you call it, and  its up to the discretion of
the border guard as to whether they classify the vehicle as a truck or
passenger vehicle.  In my case, they went with the passenger vehicle
classification, and I paid, I think, 3%.  But if you get a hard-nosed
border guard, then you'll have to pay the full 25%.  I would recommend
saying a small prayer before crossing the border.