I think he lied to you.In my Reinhart foodservice days (2005ish), me and my codriver saw a bobtail tractor with what I now understand is a jifflox and we were debating what the heck that was. Took a picture of it with a flip phone for future reference. Days later I asked my dispatcher (who was a CF guy til the end) what it was and he explained it to me. I remember him telling me it was a pain the is @ss and if dont get a job at Overnite freight I won't have to worry about it haha
Several dumb outfits tried them, he was not lying about the pain in the azz.