I would not cut out any of the coroplast as it will become an issue keeping it together later on. It is very likely that from underneath you won’t be able to see a cause for the noise and probably couldn’t do anything about it with everything in the way. You might have a couple of fasteners that are not completely tight holding the floor substrate against the framing and that movement is what the noise is from. I wouldn’t worry about it, but that’s just me.
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Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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