I went up the Peninsular Development Rd to the tip of Cape York last year with my van, and saw many vans and trailers with rooted back axles (I think mostly U-Bolts on leaf springs) - some already on RACQ trucks going South, and some just waiting beside the road with fully separated axles (back down the road a ways).
Corrugations are certainly the killer - I had to screw cupboard doors back on in the van most nights, and I had the tyres dropped to ~1.4Bar - going slow.
Corrugations are certainly the killer - I had to screw cupboard doors back on in the van most nights, and I had the tyres dropped to ~1.4Bar - going slow.