I guess ill read manual but I briefed through in and didnt see nothing that says cruise does not disengage. Maybe its new technology to prevent a crash with crazy trailer sway??? IDK
In my owners' manual, 2022 1500, it is discussed in the "Cruise Control" section. Here is what will cancel CC;
The following conditions cancel the ACC or Fixed Speed Cruise Control systems:
The brake pedal is applied
The CANC (cancel) button is pushed
The Anti-Lock Brake System (ABS) activates
The trailer brake is applied manually (if equipped)
The gear selector is removed from the DRIVE position
The Electronic Stability Control/Traction Control System (ESC/TCS) activates
The vehicle parking brake is applied
The Trailer Sway Control (TSC) activates
The driver switches ESC to Full Off mode
The braking temperature exceeds normal range