Our neighbors drove from mid-Florida to NYC and back, they stayed in 4-star hotels. Bedbugs got in their car, on their suitcases, and made a home in their bedroom.
They used bug-bombs and had a pest-control company try to eradicate, but eventually had to tent the whole house and fumigate with the cars in the garage.
If you fumigate to kill the bugs, what do you think that does to you? If it kills the bugs, it will kill you too.!
If it is summertime just park your car in the sun for several days. The bugs can’t survive 140+ temperatures for extended periods of time. My daughter got head lice at school and I cleaned her room and bagged all her clothes, teddy bears, linen, and anything else that lice could hide in and put them into a truck parked in a pasture with no shade for two weeks during the Summer. Very little can survive a slow cooking oven.