Century's are made of all alum cab.
Kenworth has a Higher Resale value, Kenworth Owners has a pride of ownership like no other.
It seems the only one making money is your cousin, you can purchase a new truck and get an extended warr. 3yr.& 450,000 mile coverage for less...
It is not the visor like someone has mentioned, It is the windshield seal. It is a really easy fix. The head wind goes across the hood and there...
I would not drive either one, just a KW is my choice.
Check all of the shock bolts, most likely one is not tighten down.