Hi: I'm wondering whether you considered simply continuing on the front axle, without being towed? Please don't assume any criticism - simply interest. We had a failed front differential once and (long story made short) disconnected the front prop shaft and drove (carefully) to where we could get the diff fixed. Now: different vehicle, easier conditions, but it was a simple first aid solution. I'm guessing you thought that the load on a single axle crossing the more challenging dunes would be too much?A few years ago we broke a rear axle in the middle of the Simpson.
We considered several options.
1. Continue to drive on the front axle while being towed by our friends Canter.
REJECTED due to the extra strain on both vehicles that risked even more serious damage.