I'm a new Wazer from Hampshire, UK
I've read some of this post with interest. Whilst I do not drive trucks or goods vehicles as they are officially referred to in the UK, I do work in a distribution environment.
It has probably been mentioned before but here different speed limits apply to different vehicle types. See this official UK goverment page for the full table https://www.gov.uk/speed-limits
If these settings could be implemented it would benefit the goods vehicle drivers as they would be planned to primary routes as the speed they can travel is higher.