just look out for the duck bay hotel and turn there then follow road around loch it is a long layby where vans overnight, we was there last sept and there was about 7 vans overnighting, or go past tarbet follow the loch and on the left is a forestry carpark we have overnighted there. across the road right next to the loch there is a place where you could pull in, but it depends if there are people camping next to water, usally weekends they come from the cities carrying packs of cheap lager on the pretex of fishing they destroy all the wooden signs for firewood and don't have anymeans of toilets so be carefull when walking. those are the ones they are trying to ban.