I worked at a restaurant on the Gulf Coast when I was in high school and one night I parked my Chevy Luv pickup behind the restaurant, under a big live oak tree and near the dumpster. At 2am, while drowsy driving 60mph down the highway, a 2" cockroach sprang from the defroster vent and walked to the edge of the dash right in front of me. I slammed on the brakes, shifted out of 5th, set the parking brake, opened the door and leapt from the truck all in one move as the truck skidded to a halt on the shoulder. I was on the highway jumping around and knocking off imaginary roaches while screaming like a little girl. Man those things give me the heebe-jeebies!
The next day I borrowed my mom's car and bought about a dozen sticky roach traps and put them all over the cab of the truck and didn't drive it again for two days. I think I caught one or two roaches.
GoFaster, I'd highly recommend putting a bunch of sticky traps in your cab to catch any hitchhikers. A couple in your trunk might catch any that escape the cable boxes as well.