I was a trucker for a large company and they only had one truck with a sleeper. I drove it very few times and we had no time to have sex.
I have seen many lady flashers and watched a few get fucked beside big rigs at rest areas.
The closest I got to sex in a truck was in a friend's long nose when parked. It was my wife, not a lady, and not a trucker. My friend enjoyed watching. does that count?
Lots of truckers have helped my mini skirt only wearing wife into their trucks for photo shoots. She was always a lady and the truckers true gentlemen............. sort of!