I don't think dual wheels will help you carry more. I think you could get a single tire rated for way more than a Defender will likely haul. Unless you are wanting to drive this load across a field of daisies, then maybe the duals will help you tread lightly'er.I am wondering if dual rims on my 130 will solve (if possible) my load carry need. Anyone. Attempted this ever?
It is about stability indeed, and a few additional values
* I can use less expensive tires
* I can inflate them less
* I will have a better loose sand-driving ability.