Have look at this map. My preferred route is the one through Boonah - (the 262 km long one.) It has a lot of twists and turns along it, but it is two lanes along the whole route. The route through Kyogle and Woodenbong had some very rough bitumen road to the west of Woodenbong last time I travelled it that I would not tow across again. The road through Brisbane still has the climb up Cunningham's gap that my preferred route does but I would rather slow down and drive the twisty road than travel the 45 minutes extra to get the straighter road. Whilst the gravel road through Cullendore is generally in good shape, It's the bit between Woodenbong and Legume that puts me off that route, not the gravel top section.