OK, here's the difference in basic terms.
1- I don't unload my stuff and leave it where I race. I load it back up, and haul it some more. (Kinda like camping equipt., go camping, unload your trailer, play with the quad runners, load it all back up, go home.)
2- Nothin' on or in my trailer belongs to someone else, (the bank or finance co maybe!) it's mine.
3- Nobody pays me to haul our race car and all our stuff to a track and they don't control which track we go to, therefor the destination. I choose to haul it to the track myself, depending whether or not it fits our schedule of other things, like work.
4- real Race cars (our top alcohol dragster) don't need street registration or plates so we're towing a trailer behnd our dually. Hardly commercial. Maybe borderline crazy, but not commercial like a 18-wheeler.
5- We don't drive on a yearly basislike 18-wheelers, sometimes my dually is hooked up to a ski boat or maybe it's got a load of crap in it going to the landfill, hardly a commercial venture.
6- Since I don't earn my living from this type of activity, like an "over the road" driver does, sitting in that rig for better or worse, thru good weather and bad, dealing with the scales, cops, DOT, insurance agents, lumpers, and the assorted mess of lot lizards along the way, I shouldn't have to conform to their regulations. (meaning no scales, no DOT inspections, no log books, no other crap) I can understand the medical card, the Class A license, the current vehicle licensing etc. but I draw the line at "wanna be diesel truck" ststus crap.