That may be S.O.P. for you, Mr Pirate, but not typical from what I've seen on the interstates, especially in southern AZ and NM. And I never saw a trucker pulled over on my journey through there.
On I-10 between Quartzsite and Phoenix and on I-10 between Wilcox and Las Cruces, there were horrendous cross-winds and signs saying 'pull over in case of blowing dust'. The truckers were mostly doing 80, and I kept at 65 due to the van blowing around so much. But of note, some of the semis were perfectly stable at 80, while others were weaving back and forth. I assumed the latter rigs had minimal loads.