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Message: [QUOTE="me2, post: 429995, member: 3825"] Yes and no. My truck right now weighs 8200 pounds empty and 11,000 pounds full of fuel, passengers and with the 5er loaded and hooked up. The cab extension will add about 500 pounds to that, putting it right at the rated GVWR without extra people. So without repacking anything, extra people would put it over its rated GVWR. The rear axle right now weighs right around 5500 pounds with the trailer attached. The 20 inch tires are rated at 3750 pounds each. Rear axle wise, I'm not worried about overloading anything but the springs, and they will be replaced with an air ride suspension, so no problems there. Frame wise, the F250/F350/F450 pickups share the same frame specification. The F450 is rated to a GVWR of 14,500lbs. The F450 frame has slightly different cross members in the back, but the section modulus behind the cab is the same. Ditto the F350 DRW frame which is rated at 13,000 pounds. When I splice the frames together, I'm going to reinforce the frame, increasing the section modulus in the middle above what it is on the F350 and F450 DRW trucks. Frame strength and stiffness should not be a problem. As far as brakes go, the F350 SRW trucks (GVWR 11,500 pounds) share the same braking system as the F350 DRW trucks (GVWR 13,500 pounds) with the exception of the rear calipers. I might swap DRW calipers onto my truck for enhanced braking capability. When all is said and done, I should be right at the GVWR for my truck, but the frame, brakes and suspension will be upgraded to handle loads higher than its GVWR. I don't want to start a big discussion about this, but yes they will. [/QUOTE]

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