Awhile back I posted a few pictures of a long logger. This truck is similar but designed differently. This trailer is steered by 2 cables that tighten or loosen on which way you turn. So the trailer off tracks to the "outside" not like a typical semi. Canadian built Western Star w/ Cat power.
@okiedokie, is that set up with some sort of centering lock? Can't picture the dot being too fond of the cable steering on the highway. Cool setup, though!
No locking mechanism. Setting the trailer up to track straight can be tedious. Adjustments of the 2 cables and a wedge that fits in the 5th wheel are the primary parts. DOT in most states don't even understand the operation and key components. In most cases the gas co. ummm contributes to the state fund program and we just roll on by scales. Gotta pipeline to build.
There is a center pole that is used to adjust length for different loads. That keeps it somewhat straight. Until you turn then cables help pivot trailer axles when empty. Pipe keeps truck ridged loaded. But yeah not the most solid set up.
They work fine on the highway, no stability problems at all. You can get some off-tracking, but it isn't really a big deal given the length of the trailer. The only way you're going to have an accident is if one of the cables or its hardware breaks. So, just like any other trailer, you have to do thorough pre-trip of critical components and ensure all the proper service has been done. It's especially important to make sure all clips and pins are in place.