^^^ Along with what Chuck said, when it comes to "big box stores," they normally stock "local code approved materials".. In wall paneling, that's typically 1/4" thick 4x8 foot sheets of finished (on one side) plywood or OSB. In RV's, most wallboard and ceiling panels are 1/8" thick. That's literally half the thickness as what's stocked at Lowe's or HD and also half the weight....
Going to a big box store can be cheaper and in many cases, they have what you need (or what you can use as a substitute) in stock, so people tend to "switch from thin to thick"...
Be aware that unlike a S&B house, an RV has a "maximum weight it can support" and every pound you put "on the walls" is a pound you can no longer use for cargo.....
In RV's, weight is not just something to think about, it's CRITICAL to maintaining functionality in towing, handling, safety, reliability as well as looking better or repairing a soft floor.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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