I don't know, I work for a coal mining company and their trucks are driving off road all day every day. They don't use any Dodge trucks but they have Chevy, Totota and Ford trucks.
While driving their tundras on washboard roads, they really do shimmy bad like that. Over 20 mph they get scary. They are fast and the interiors are quiet but the entire chassis twists like a red vine and the rear end hops around like crazy.
They Chevy trucks are the same way only with a lot more squeaks and rattles. If you watch in the mirror you worry about the bed bouncing right off the truck.
But the ford trucks are so much more solid. Less shimmy, less shake and they can travel comfortably at higher speeds.
Maybe if you only occasionally go off road you wouldn't notice, but to me it says a lot about the strength and long term durability seeing each truck performs off road every day.
So I don't believe the test is fixed. Maybe you have seen test about the torsionally rigidity of the f150 frame over other half tons? Or that must have been fixed too?
Each truck has it's own strengths and weaknesses and people will buy what they like. But my personal experience shows that those tests are fairly accurate in the real world.
I'm not trying to bash any particular manufacturer, these are just my observations.