an awful pity that this suggestion is so miserably sourced, since I consider it worthy of entry.
for the English side:http://www.bartleby.com/61/56/T0385600.html
1. Articles of commerce; trade goods. 2. Garden produce raised for the market. 3. Informal Worthless goods; stuff or rubbish: “Look at your hands. And look at your mouth. What is that truck?” (Mark Twain). 4. Barter; exchange. 5. Informal Dealings; business: We'll have no further truck with them.
here meaning 5.http://www.askoxford.com/concise_oed/truck_2?...
• noun 1 archaic barter. 2 chiefly archaic small wares. 3 N. Amer. market-garden produce, especially vegetables.
• verb archaic barter or exchange.
— PHRASES have no truck with choose to avoid dealings or association with.
— ORIGIN probably from Old French; compare with Latin trocare ‘to barter’.http://www.m-w.com/dictionary
3: close association or connection "will have no truck with crooks"
In modern English I'd only consider the fixed idiom: "to have no truck with" as being still alive and breathing, especially outside of professional circles who may still use the word in its other, more arcane/archaic meanings.
I won't offer German source material, since I think the DE-natives can do a much better job than me.