Not to rain on everyone's parade, but page 253 of the PDF version of the owner's manual specifically says "We do not recommend using your pickup for carrying a slide-in camper"
https://www.fordservicecontent.com/...-Owners-Manual-version-1_om_EN-US_07_2021.pdf
https://www.fordservicecontent.com/...-Owners-Manual-version-1_om_EN-US_07_2021.pdf
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