In commerce, or for commerce. Because both of those will mean different things. If you are in commerce, as in going to the feed store to buy feed for your own operation, or to the lumberyard, I would think that you would be exempt. Now if you were a framing contractor or a landscape contractor, it would shift to be for commerce, and become a commercial rig.
Sounds like another Federal government Carrot on a stick for the states. They lure you in with the carrot, and when you aren't looking, whack you with the stick!
