People think that because the vehicle sits on rubber tires that it is safe.
A lightning bolt can traverse 20 miles in a second...a few inches of rubber is no problem................
Rubber and that few inches of distance, allows static to be effected and charges as well.
Most survive a hit in a car. You tend to be dry inside that helps you survive.
Complete myth, it's got nothing to do with rubber tires. It's because the car's body and chassis is a Faraday cage.