I don't know. I'm sure if they did, it would have been most likely around the east coast of the United States. The dense population centers of the eastern US are more similar to the dense European geography than any other part of the US during that period of time. By the mid 1950s, North American truck manufacturers were adapting their vehicles for the newly constructed interstate highway system. Continuous high speeds, long uninterrupted driving shifts and larger, more comfortable cabs would have possible made typical european truck platforms unsuccessful in the "States". Volvo tried to enter the US heavy truck market in the late 1950s and failed. They didn't get it right until the late 1970s and they had to acquire an already existing dealer network. To my knowledge, the first Mercedes truck to have limited success in the US was the L series of the late 1960s and early 1970s. There were a number of European auto manufacturers trying to compete in the US after WWII. DAF and Skoda tried an failed to sell automobiles in the US. Furthermore, with the 1966 US federal vehicle regulations requiring safety and pollution controls on all new automobiles, most smaller European manufacturers were eliminated from the US market.