Re: Smoking brake (just one)
I was looking at an E-450 based rig and this happened on the test drive. Just one front wheel, smoking and hot as fire (although not ON fire). After it cooled down it drove normally (although the issue was still lurking). It was a friend of mine selling it, so although I decided it was too large for my purposes, I did find out that it was a stuck brake caliper ("caliper slide" IIRC). When I took my E-350 in for its first service (under my ownership) they specifically mentioned lubing the caliper slides (if I have the term right) because apparently they are somewhat prone to this.
Side note: I paddled the Main Fork of the salmon years ago (raft-supported, whoo, big coolers on the rafts meant lots of fresh food!). Was a great trip!
Also, wow, that hot springs looks amazing! I want to be there.