Thanks for the info guys. I will be doing the trip in about a week and was a bit worried about unsealed road works, I haven't handled anything as big as a R3T in the gravel before. Rode dirt bikes for 30 years but I don't think that's going to mean SFA. Pete k, glad you enjoyed the trip. The ride from Cairns - Innisfail - Palmerston - Atherton - Mareeba and back to Cairns is a ride I never get tired of doing. Plenty of great places for a counter lunch and cold beer along the way.
Cheers.