We are flying into/out of Inverness and are thinking about making a tour through Scotland similar to Rick's best 2 week trip with a car. We have been to Edinburgh for a week previously and are interested in the sights between Inverness and Glasgow including Isle of Skye. Can this be done via train/bus with ease or would we be much better off with a car? We have 9 days and 9 nights. TIA!
It's certainly possible to make some form of tour of that area without a car but the RS tours include various on the road visits which may not be possible without a car, although some may be substituted by similar locations. Much depends on time of year. Inverness airport isn't known for easy flights from USA, how does this work in you plan? If it's simply connections via Heathrow you'd probably be better going for direct flights to Edinburgh or Glasgow.
You will find exploring Skye without a car to be highly frustrating. There are bus routes on the island, but some well known tourist sites such as Neist Point, Coral Beach and Fairy pools have no bus access. Buses are also not that frequent.
Due to logistics, Skye is best seen by car. However, most of the rest of Rick's itinerary is doable by public transportation. But, it may be a bit rushed for 9 days.