It's no problem for the car. It's not much more than a mile of track to the top parking space. I wouldn't fancy camping there, it is wide open rough ground with sheep everywhere.
I was up that way last week. I parked at Spean Bridge train station with no particular plan. Cycled from there to the Lairig Leacach bothy. I reckon it took me about 2 hours, there was some deep snow on the track. I went up Stob Ban. From the summit back to the car took me 2 hours. 1 hour walk 1hour bike. The bothy is small but looks all right to stay in. It's a great cycle and you miss some impressive river scenery whizzing in in the car.
All the best it's a great area
View from Stob Ban last Friday.