Those are Unimog 404 axles.
It´s surely a way to go but nothing that´ll make you happy in everyday driving.
The axles are pretty heavy, to start with, and were neither developed nor build for the speeds of a regular car. This is an issue you may encounter with Volvo axles, too.
Other than that, the Unimog axles may be known as unbreakable, but there are a few weak points and these may be addressed every 3-5000 miles.
I am not promoting any axles or portal conversions, but it was for a reason that Mal Storey developed bolt-on portal drop boxes and it´s a concept that´s been proven for more than 10 years on a variety of cars, which are road legal with their conversions, too!
So long & greetings from the road!