The uose for natural gas are typically very stiff. Do a search on line for lp hose with the size female QD and the size male QD and you'll see hoses available. Or as was earlier suggested go to a propane company and they can make you one. Another option is to remove and replace the end in your photo with the corresponding size of what's on the camper.
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Marshall
2012 Laredo 303 TG
2010 F250 LT Super Cab, long bed, 4X4, 6.4 Turbo Diesel
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