the beartooth descent into Red Lodge MT is straight down the side of a cliff, with about 6 switchbacks snaking the road down. there are no pull outs that I recall on that part of the descent. the switchbacks themselves are wide enough for you unless you meet some yeahoo just as big who is coming UP the road. LOL
it's just not a good road for a long, wide, heavy rig. period.
it won't be any fun for the driver and the passenger will probably be scared stiff.
do yourself a big favor and drive it in your truck. :)