Just did the haul road. It destroyed a kenda 270 but was pretty easy. Plenty of dust in construction areas. Mosquitoes are BRUTAL in coldfoot- bring DEET and a head net. The food in coldfoot is awesome. If you meet a guy named Olaf with a huge chin beard, talk to him and buy him a beer- he's one cool dude.
Lighter bikes should be fine, but some loaded GSs said the calcium chloride mud was very bad. I guess the water trucks are over dumping water due to how dry it is lately. I didn't have an issue on a DR650 with a K60 rear and kenda 270 front.
Some asphalt, more gravel, and most hard packed dirt. Atigun pass was clear and in good shape. The run up is totally worth it for the brooks range and even the north slope which is unique in its vast emptiness. You will never see a city like deadhorse- no beauty all function. If you want to know anything else, just ask. Good luck guys and have a blast. I did, and now I'm going back down to valdez!