I went up and down the A82 last week, the killer area is between Inverarnan and Tarbet.
(I've used this road on more times than I care to remember).
One really has to take it it slow and easy with a caravan, saying that, even with care there are sections where should you meet an oncoming longwide vehicle, there is the possibility of having significant difficulties.
Going north is worse than going south as the rock faces and other projections could easily take a chunk out of your nearside depending on the circumstances.
It's best to 'waitpause at the really tight bits in order to have at least some indication as to what is oncoming.
If you are in any sort of hurry then avoid this section.
Bear in mind that articulated lorries do pass each other going in opposite directions, but mostly the artics avoid the route as sometimes there is 'no going back' if the road behind you is backed up with heavy traffic.
To be honest, it is not much fun in a car let alone with a trailer, but if you like a little exhilaration, go for it; I still do but only at times when there is likely to be minimal traffic, and you could still be unlucky
hmy:
Despite a fairly recent upgrade to the section, the Scottish Government really needs to invest on a road on stilts on Loch Lomond for this section, cost and aesthetics and the environmental brigade are all obstacles, but this section of road is abysmally short on practicality.
And that is from a Haggi.