Speaking from experience it is not nice travelling on those roads from May to September as the volume of traffic is high, hire vans are a nightmare as are one make car clubs who seem to think the route is a race course. We pulled over to let a Porche 911 past on the Applecross to Shieldaig road and he counted 32 cars travelling in close convoy behind him! We were there for ages until they all got past... Unbelievable.
Sadly it's getting as bad on the Hebrides as well with local press bemoaning the seasonal "invasion" of motorhomes. I cannot see an easy solution to the growing numbers of vans on these small roads.
K