Early trucks were small, but as engines got larger,designers made larger trucks that could transport almost anything. Long distance trucks have big engines but there is still room in the cabs to make drivers comfotable- some even have beds! How many cars can you drive at a time?, You can only drive one car at a time- but a moden car transporter can carry as many as nine. The uper deck of the transporter lowers at rear so that cars can drive into it.