I am curious as to what offroading you have done with your dually. That term means different things to different people and I would be interested in how you define it (or rather use it) in that case.
i would say light offroading. The kind of offroading you can do with a class C /B motorhome that you lift and get some extra clerance. So logging road and forestery road of BC and alberta and rocky or sandy beaches etc. The transit platform is still limited in what it can do...and i dont think making it a super single make it more capable. But i definitly dont have the capability of offroading like the vehicle you have in your picture!