In reply to KennyWright:
Have cycled in to Duinish with a single wheeled trolley. Good all the way except a km or two max across the tussocky bit after the loch which I pushed my way along. From Duinish itself from what I could see, it is a good 4X4 track again all the way to Rannoch area. The drop put me off continuing as I knew I'd have to come back up.