Thanks everyone for all the great feedback. I wondered about the durability of the boxes that are riveted, but the majority are made this way and are built for commercial use so I assume they are engineered and made to hold up. Converting one into a RV should only strengthen it with the interior walls acting as reinforcement (if they are tied into the outside walls). As Geof said, in buying a used one a detailed, thorough inspection is key. $8900 for a new one isn't a bad price though and you will start with something you know will be watertight and straight. They could also put in all the cutouts when building it, making the build process much easier and cleaner. I assume they could also build in the insulation as well if making a new one. So much to investigate :-)
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