That's pretty bad ass ..
Just the other day, i was watching a video from HeavyDSparks, in that video he acquires this haul trailer and a couple of mini trucks as well, one of them was a Mazda Dually!!! It had a 6 lug set up, so it may be something for you to research ..
Now if you are comfortable doing custom work, Toyota made a dually minitruck, they used them for u Hauls and campers too. Those are easier to source parts for I'm sure and worse case scenario you have to make a custom drive shaft. Just a thought, why not make it bullet proof right?
Good luck
Here is the video ...
https://youtu.be/xomd6cKJe7Q?feature=shared