I don't know if this is specific to RSN but I noticed it only now, since I'm playing a lot more now, but I realised while going over the points that there is no cabsway.
There’s is no cab sway in any DLC on TSW. You are always ‘stuck’ to the cab regardless of how fast you’re going.
Yea it has been that way since TSW was released in Beta, I for one really miss it. After I've played TSxx for a while then try TSW I really notice that it isn't there. Seems like such a simple thing but it really seems to ruin any realism.