I had A3's on went I went last summer and they were fine!
Its more the rider's confidence, I think. I would recommend some practice with gravel road skills. Picking the cleanest part of the road and focusing on it. Keeping your arms and hands relaxed and letting the bike move under you.
Also, I live in a very rural part of Mass. so I'm used to traveling along miles of empty roads with no houses but I can see how that would work on someone's psyche if they weren't used to it.
Make sure your bike has no maintenance issues to niggle the back of your mind.
And try to remember that you're doing this because it's a wonderful ADVENTURE after all and you may never get to do it again. :thumb up:
As far as speed: a few times the road was clean enough to do 55 but mostly I liked going 40 in 4th. At 4,000 rpms, throttle response is easy to manage on the bumps.
'15 Tiger800 XRx
'99 Triumph Thunderbird Sport
'89 Honda NX250
"Why don't I have tattoos? For the same reason you don't put a bumper sticker on a Ferrari."