I agree he needs to convert it back to a double
attachment point hitch. It's not meant to roll or yaw,
just pitch up and down a little at the two hitch points,
with the swivel wheel suspension doing its part too.
One of these essentially converts you to a longer
vehicle with a enter pivot point to judge your [and
its] position and direction from. Just adjust your driving
to that, like you would need to do for any other driving
configuration you are not used to.
Here's a link to the overall topic:
http://www.singlewheel.com/Cheers,
Norm/mezmo
If you have a house - you have a hobby.