I'm not sure what you're describing as "voids", but I've owned 3 Montana's ... all 3 over time have shown areas above the seams where it appears the rubber roof has come unglued and slightly "puckerd". I was and am always concerned, but the "stealers" service people always claimed my small puckers were normal. A call to Keystone resulted in "unless it's a large area that billows from the low pressure air traveling over the fiver going down the road, it's a regular occurance."
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