As Dani said. It will be classed as an out call.
I can't see many girls being up for it.
I met someone in a lorry before but I worked for an agency so gad someone waiting for me.
It's not very comfortable though especially if the guy is larger on the weight side of things
Not sure about traveling to meet in a lorry, but there are many girls who are up for car or outdoor fun. There are those who openly advertise and there are those, who if you get to know them, are very keen; especially in the Summer. Not the majority of my punts but a decent number. The adventurous, left field type.
There's a couple of prossies who actually go around in camper vans and do it too!