I tried for the same reason. It comes down to a lot of variables though. The truck wheels follow a different path than the trailer wheels, and you need to consider the path the back end of the trailer follows as well if there are obstacles.
I ended up just driving the most natural route i could find. I stopped when I was heading the other way and painted the boundaries of the inner and outer wheel paths left in the grass. Then I drove it a couple of more times trying to follow the first path to make sure it was a smooth route. Finally, I drove it again a couple of more times, turning a little early and a little late to see how that changed the route, and adjusted my borders.
