How hard is the track birdsville-boulia-cloncurry-karumba

Im thinking about doing this trip in a 4x4 motor home in September.From there i will work my way up to the tip.My motor home is a rodeo with a large fibre glass back on the rear.The suspension has been improve and raised 2 inches.I carry spares and tools and have done a fair bit of 4x4 driving in standard vehicles but not something of this weight or length.So until i take it of road im not sure of its limitations.I will try and do some trips before then to get the feel of it.Deep creek crossings or wash outs would be out of its limits.Any advise would be great.Thanks Stuart and Gunny.