Everyone who tows chould consider having a commercial license. I can tell you that way too many times the officer that pulls me over for speeding, or ??? has given me a bit of slack, as they feel that if you drive a lot, or commercially, you could use a little leeway. I carry a class "A" commerical, with bus, doubles, and the rest. A medical card is required annually.
Our rig is licenced as a RV for the trailer, but the 6500 Chevy truck is a non-commecial plated vehicle. I do think the less logos the better on the outside. A circus wagon looking tow rig is begging for the "spanish inquisition".
Greg, you are right, I have pulled into scales, and they ask why I did. Others may chase you down, and want you to come back to the scale house. Not for weight, but for licencing, insurance, or is some states, a commercial permit.