.... .60 ON THE OUTSIDE IS ABOUT THE TOP OF THE LINE....but if it is not a Showhauler and few other brands you might have a different arrangement ...I'd have to lift the interior corner to see for myself....OR you can contact the manufacture and ask...[it is easier and lot less time consuming].....I'd also ask for a reference to the build out, such as a brochure or a website with a video....without >1.5X1.5 steel tube that is welded in place and made part of the superstructure ya might have a problem....then again you might be lucky and have one of the first unites which were built a lot different....before they stated to cut corners and cheapen "lighten" the frame work....I'd make the call to United with the serial number handy and talk to them.....I have rebuilt a trailer with a steel frame SPF insulation and a 3/8" interior plywood sheeting....it was built like a tank and didn't even have flexing ripples{IMPOSSIBLE AS IT SEEMS}....geofkaye
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