Springs yes.....thats what i did. I just modified the spring saddles to suit a 45mm axle.....with suitable U bolts. Using the spring saddles, i was also able to mount the shocks exactly the same way it left the factory.

I could've figured out a way to use a diff housing, but it was easier to get a solid axle with a stub axle welded to it. Much like a camper trailer has. My one is rated at 1400kg so its more than enough for what i'll be using it for. Plus it come with disc brakes and HQ stud pattern.

Using the original chassis i found to be easier and the geometry for mounting the springs was already there....so it was less work.

image.jpg