Hi, just a personal experience from Loch Lomond last year. If it's Loch Lomond you're set on, as far to its North end as possible, even better an island. If it were me returning, I'd stop at Lomond to take a picture then keep going North and leave that one behind.
I arrived late one night last year whilst on my way back home from farther up North and decided to throw the tent up on the shore (about half way up the Loch). At 2am I packed up and left. I hadn't realised how close to Glasgow it was and within easy reach of the boy racers, druggies etc. I didn't fancy waking up to find my tent alight with me in it so i packed up and left.
I don't like to put down an area or put people off visiting i may have just caught a bad day at Loch Lomond!!
On a positive note, i did have a long chat with a bloke who lived 500 yards away, i explained my good intentions, we had a good natter and he left asking me to knock on his door if i couldn't get a fire going for a brew. Good bloke although he could have told me about the hoodies from Glasgow !!!
You could always have a look at Inchconnachan Just be ready for the unexpected