Chains are usually 4 day work week with 1-2 and 3 day routes. I think it would be possible to make $75K on chains I don't quite know exactly what the chain guys make a year, because they kept separate from the broadline guys like my self and usually based out of the warehouse.
As for there service area in N.C. I don't know it depends what chains they service. I know our Pottsville warehouse went from Pottsville, PA all the way up to Boston and all the way to Baltimore. The warehouse that loads my drop lots trailers there chain drivers go into Ohio, Pennsylvania, New York State, Virginia they did go all the way from Pittsburgh to Virginia Beach, VA.
So basically pick all the states boardering N.C. and you'll be headed there, with chains there's goofy overlap because of where certain restaurants have there stuff brought to and stored. Like GFS had a chain warehouse in Greenville, SC that warehouse is closed, but they built a new warehouse in Douglasville, GA and where the warehouse in Greenville, SC used to be it is now a drop lot. I would have to bet there is overlap between you guys and there warehouse. I don't think you would get any Florida, but I'm not 100% sure of that.
However, I am sure you would get VA,TN, NC,SC and maybe creep up into Washington D.C. and Maryland. I don't think you would make it all the way to Kentucky, but I can't be sure of that. I know either N.C. or Douglassville, GA one of those warehouses in doing TN because Shepardsville, KY is to busy.
I hope that helps at all.