I guess laws vary, but 100% legal here. I'm only at 13'2" height, legal is 13'6". Scaled in once at 92,500lbs, which I was over on the trailer but easy to get legal by putting extra buckets in box. Width is irreverent, the loads not changing width with a different trailer.
I'm so happy I went with the tag, it's so much nicer, and not having a truck sitting 90% of the time because i'm only moving the machine on average once a week.
The only move I regretted it was a out of town job, 3 hours on the highway I did wish that move I had a lowboy. But the other 99% of the time, it's so much better then a lowboy.