Tim,
I met a man in Minneapolis. His name is Gordon Smuder.
Early in Playmobil's life time, Gordon just started sending them drawings/drafts of things he thought Pm could do.
He received correspndence from Hans Beck himself.
And actually was able to get som free PM out of the deal, too.
Gordons drawings were the inspiration for the Mississippi Queen riverboat.
I think all you need to do is send Geobra photos of your various customs.
Tell them what kind of trucks they are and how they are used. Some people are not vehicle savvy, at all (and I am one of them)
Tell them how you made them.
Say that you sent them as kind of an inspiration for PM to make more diverse trucks.
Include your address, and phone number.
I am sure you will get some type of response.
I also think Gordon should do the same.
His fire/rescue vehicles are cool, as are yours
But it helps working with a person who know how they should be kitted out.
Its just an idea, but what is worst that can happen?
Life, and your trucks are worth the risk of possible (but improbable) rejection.
Meg