We stopped in North Carolina three years ago for my nephews wedding. We were there three days and saw them on the exterior of the coach and found a few inside. While driving into DC a few days later I saw one climbing my "A" pillar. I crushed it with a Kleenex. That was a huge mistake. The smell was atrocious. We found several through the trip and one or two every trip for two years.
I know they get active in the heat. Maybe crank the heat up to 80 for a couple of days and flush them out.
We're doing a coast to coast trip this summer and intend to fuel up and drive straight through the area if I can.