A friend of mine (also a SW), bought some time ago a camping car. She use it to drive in the evenings to some highway parking places and she offer her services to car drivers that make a stopp there and to truckers that overnight there. It is quite practical, she has in the car a good wide bed, a chemical toilett and a shower. Once she invited me to drive with her. It was quite intersting. She explained me how it works there. Dress code "whorisch", mini skirt, blouse and no bra and also the rates to ask. After parking we went outside of the car and waited there for customers, they came quite soon. Some just asked for the rates and went away but others accepted the offers. When she was with a customer in the car I waited outside an and she made the same when I was attending a customer in the car. I got three customers and she four. She told me, that this "system" has increased a lot and more and more SW use it. In the parking place we visited there where two other camping cars with SW's. In between she knows where are the "good" parking places and tose who are no so good.