While there is no official entry for a product titled "ENG Motor Home DLC Voice RJ01334555" , the RJ-code format suggests this is a voice drama likely found on specialized platforms like

There is no way to temporarily mute RJ without disabling the entire DLC. Sometimes you just want to drive in silence or listen to a podcast. A simple hotkey (hold V for 3 seconds to mute) is desperately needed.

For manual setups or standalone platform installations, the downloaded .pak or audio folder must be placed directly into the game's root directory under DLC or Content/Audio folders.

Unzip the files if they are in a compressed format (e.g., .zip, .rar).