Check with local DMV or better yet DOT station as there is lot of misinformation beside different laws in each state.
Again, per my knowledge you don't need CDl unless the vehicle is over 26k lb no matter if registered commercially, or for private use and no mater even if you use it for hire.
Same with pulling into scales. The law says all commercially registered vehicles should pull on the scales, but at some stations you will find signs "no pickups" (if you know definition of pickup) at other scales it might be "Vehicles over 20,000 GVW" and so on.
The law has so many variations that even DOT officers don't know each application.
