Do you need a DOT card?
I do. As for whether you do or not, that depends on your
situation. If you have a CDL, you need one. If you operate a
commercial vehicle of 10,000 lbs. GVWR or greater - even without a
CDL - you need one. For RVs, farm vehicles, and other types exempt
from requiring a CDL by the federal government, that's a state
level matter, and your state's DOT would be the ones to determine
this.