23 years ago my Nephew and I had a used car lot where we would fly down to Florida and buy mostly Pick-up trucks and Conversion Vans, and ship them up to N.E. Ohio. 30 to 40% of the Vans we purchased had cockroach infestations so bad, they had to be professionally gassed by Orkin. Some vehicles needed two and even 3 treatments to get rid of the little buggers.