Bloody hell....good idea about the suspension seat if it helps your back. Hope you get it sorted soon and can get back out there.
We will get up to the Cape one day, hopefully, but would like to take the missus out to see "the rock" first, I was out there with a group from the Outback Way group/council a few years ago and it was amazing to see, we travelled from Boulia to Laverton via the Plenty Hwy and Great Central Road.