1. The Op say he was open to weight redistribution so there's no reason to assume 30lbs dead weight over the rear wheels.
2. For a 1 off tour, new bike, combined weight I would tell the Op four things.
Look online for reviews to see if anyone is having issues with that particular wheelset failing. If it isn't happening to others it probably won't happen to you. Google is your friend.
If you are uncertain how to do it, have the wheels looked over by a good bike tech to make sure they are tensioned correctly.
Do some pre trip tripping to sort things out.
Enjoy the ride. Something unexpected might happen but that's part of the adventure. You will probably figure it out.
Nothing wrong with the Op asking the question. From my perspective, suggesting they replacec a new wheelset with a different wheelset "just in case" is the wrong answer. That's all. Its a knee jerk reaction to a problem that doesn't even exist yet. My advice is: go ride the bike some - then see what the issues might be. Dont try to solve theoretical problems that may or may not occur within the parameters of a single trip.
Last edited by Happy Feet; 04-28-18 at 10:21 AM.