Where in the US 26/Mt. Hood National Forest corridor should Cycle Wild camp in September?

Yes, yes, the September "Mt. Hood-US 26" corridor trip is still two months away (Sept 21-22), but Cycle Wild is now thinking about the logistics. But where to camp? Cycle Wild has a few choices to pick from. The first one is Tollgate Campground.   This campground is on US 26, just east of Rhododendron, about a...