Ram dually vs Ford dually Frame Flex Comparison

Has anyone here or anywhere had trouble with their tailgate because Ford uses a C channel chassis? I've never heard anyone complain of this other than some goons on a Youtube video deliberately trying to damage a truck. I'm more concerned about the Ram's crappy little dried up ball joints and iffy AAM rear axle than I am about a tried and proven C channel chassis that can be flexed if loaded to the max and driven up on properly placed offset ramps as if that's normal every day occurrences.