2004 F350 has excessive chassis corrosion.It has 17,000 miles. Why on 2004 Ford F-350 Super Duty

It's never near salt always kept immaculate.
Shouldn't have been undercoated to prevent this from happening? What's the warranty on something like this?
I also have to have shocks, "L"springs, etc. replaced.
The brake pads literally fell out. What a disgrace Ford.
The mechanic broke tools removing the calibers. Now that's rusted!

Asked by for the 2004 Ford F-350 Super Duty
Yikes! maybe the air in NJ has a lot of sea salt.