Full pics & some info... 2017 Super Duty

A little frame twist never hurt anyone! I think the whole frame twist debate is way overblown. There are advantages to C channel. For one the whole rail is coated inside and out, whereas tubing may not be. I had a car trailer one time that was made out of box tubing and it rusted from the inside out. Also, there's the bend don't break school of thought. Skyscrapers, bridges and ships are designed to flex because if they were too stiff they would break. A good buddy of mine formally (up until December of last year) worked for Metalsa Frame Div., they build truck frames for Ford and others. He told me that Ford and GM have been having trouble with these new super stiff frames cracking. Their "fix" is to put some extra welds in the area where the cracks are known to occur. I understand the thought behind having a stiff frame, better suspension dynamics, less NVH, better handling. Same reason race cars use ultra stiff chassis, but then again race car chassis' are junk after just a few races. I think this is all just marketing hype, JMHO.