The International CV Series Chassis modification is an enhanced version of the base truck designed to support a variety of trailer types. Key features of this version include:

Price: the cost of the base chassis has been reduced by $3500 and the flatbed is now priced at $3500.
Hitch functionality: options for 5th wheel and Gooseneck are activated only when used.
Improvements: lowered 5th wheel height on platform for better compatibility.
Compatibility updates: fixed connections for Semi/Gooseneck according to patch 1.3.0.0.
Removed options: removed “Platform with 5th Wheel” configuration.
Added options: added separate options for Gooseneck and 5th wheel to the platform.
Flexibility: new option for platform without side panels.
Tire selection: new tire options are Michelin Crossgrip, Michelin Multibib and BKT Multimax MP527.
Appearance customization: added standard colors for rims.
Customization: wheel/tire and engine customizations are available.
Compatibility:

5th wheel chassis supports all Semi/Gooseneck trailers, bumper trailers and farm equipment.
Platform/dump truck only supports bumper trailers and inventory.
Box truck does not support trailers.

Credits:
Frylock364