Don't forget that car has a huge boot . I used to fit a complete bmx into the boot of my mk2 cortina ( mk1s will also work and can fit a cement mixer ! ) without having to do anything to the bike , just slides in . You get some funny looks taking a complete bike out of a boot
I've known a few people take the rear glass out and leave the bike hanging out of the back
Never had my bikes attached to the outside of a car .

I've known a few people take the rear glass out and leave the bike hanging out of the back

Never had my bikes attached to the outside of a car .