Can not say we have ever had a flawless roof on any of our units, but have to say our New one seems to be the best. The radius support beams look even to me, and unlike the previous units, roof membrane was installed tighter with less bubbles. Re the nail pops, we have experienced that with the old units and that seems to be a common problem. If by flimsy you mean that the roof itself is soft and flexes when you move on it and you have a lot of nail pops, that is not normal and may be indicative of moisture getting into the wood under the membrane.
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Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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