Dear HaPe-CZ, I am writing this as a member of OSMF's Data Working Group. Adding "TRUCK/LKW" as a name to any service roads or parking areas is not acceptable. It is not the name of these parking areas. You may use access tags (eg motor_vehicle=no,hgv=yes or hgv=designated) to show that something is for trucks only. OSM is an international platform but that doesn't mean that you can label things on the map so that you and your compatriots have it easier to navigate in America.