OK so don't keep me wondering??????
What and Why
Here is your own thread.....
https://www.turbodieselregister.com/threads/247523-Freightliner-Chassis
Or this one: https://www.turbodieselregister.com/threads/248363-HDT-RVing
Nick
Also they are supposed to be a more ridged frame causing less flex and eventually leading to damage to the MH body its self.