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I have it at 6730 plus we had the vehicle a little farther forward than I would have liked on the trailer, due to where the tire cups & straps are located. And there's the camper shell, the bed platform, the futon mattress, our luggage for 4 days.. well I couldn't double all that because it's a half ton truck and the manufacturer states in this configuration it can tow up to 9050 lbs and the maximum payload on the door sticker for occupants and cargo is 1380 lbs.
Coincidentally my wife and I together weigh a bit less than 380 lbs, so the half ton truck can haul a half ton in addition to both of us.
This seems to be a topic you're passionate about but I think you might be barking up the wrong tree. If I needed to haul more than a half ton maybe a half ton truck wouldn't be a good idea... like if you stuck a 5 quart oil drain pan under a Cat 330 and it overflowed would you blame the 5 quart pan for being undersized? My half ton truck does this half ton thing pretty well so whatever problem I'm supposed to have with coil springs has yet to make itself apparent. ?