You know maybe I am a premature old codger/retrogrouch but when I hear people whining about an extra 100 grams on their wheelsets it makes me think they've either been really lucky touring without wheel problems or they've never had to walk a bike for two days or sleep beside a highway when they couldn't hitch a ride to the next town and all night long loaded logging trucks rumble by mere feet from your head.

Man up and get some beefy wheels, you get used to it. I pull as many miles as ppl on race bike/trailer setups and my bike weighs 100lbs all loaded up.

That's just my 2 cents though, feel free to disagree and do what works for you but in my experience, I've never heard anyone complain that their wheels were too beefy/heavy while on a tour.