I went all the way to the tip and to Weipa on the way back towing 3400kgs in 2020. I went just before the school holidays in May for memory as I have heard its best to avoid that school holiday period. There were times when I could do 80ks p/hr and other times when I could only do 10-20. Those times were only for shorts periods, perhaps a couple of kms each time. Some of the corrugations were rather large but if you drive to the conditions you would be fine. The only thing I broke was a cupboard latch, although that red dusk still appears out of crevices in the van. Well worth the experience.