Lewiston to Lolo pass highway 12 road questions

[Bken72]

Hi all, we are planning to travel on highway 12 through Idaho on our way from Oregon to Montana. We are in a 1 ton Silverado gas motor hauling a 33 ft crossroads travel trailer, which is pushing the boundaries of what the truck should be hauling. We are looking for info regarding concerns we should have on any of the downhill sections and whether anyone has had any major issues such smoking the brakes. Any input as to whether this is a stupid thing to attempt, or if anyone has made the trip and has suggestions etc. is much appreciated.

[agesilaus]

Know how to downshift. We went up that way and it's a fantastic scenic route. It follows the river for much of it and kayakers and bicyclists are all around. At least during normal times. We had no problems with the truck and while there are grades I don't recall any extreme climbs or drops. IIRC the road climbs steadily for the whole first section.