If I can give a bit of advice it would be don't use the A82 all the way, the road at the side of Loch Lomond is rubbish after Tarbet
At Tarbet don't turn right to follow the A82, take the A83 for Inverary. When you get to Inverary turn right just as you go in to the 30mph limit through the archway on to the A819 for Dalmally. You will reach the A85 at aT junction, turn right for Dalmaly and follow back to the A82. It will bring you to another T junction.
If you turn right the Green Welly shop is only a couple of hundred yards away where you can also get fuel. Turn left and it will take you through Glencoe on the A82 towards Fort William.
This detour will only add about 40 minutes to your journey but the roads are much better for the bikes and you dont risk getting hit by a tour bus on the narrow Loch road
If you need any advice drop me a pm and I will give you my mobile