We have a 3-horse gooseneck that needs to be converted to a fifth wheel because no one here in Portland Oregon would install a ball on a truck bed. Seems the insurance providers have since frowned upon goosenecks.
Anyway, I thought another way to help with the alignment would be to electrically power the trailer with about 150 pounds of torque on each differential. Aside from alignment duty, if the electric motors could be synchronized with the tow rig, then the extra torque could be used for smoother starts and stops.