Corrected entry: Where did they get right hand drive vehicles from? In one scene they are driving right hand drive service trucks.
Corrected entry: In orthodox religion we don't use standing statues of Jesus as shown in the movie. We either use a picture or Jesus on the cross.
Correction: It is the body (something like a mummy) of Saint Gerasimos, which is a holy relic for Cephalonia.
Correction: They could have been driving one of the many thousands of captured trucks that the British abandoned in France, Greece or North Africa prior to the period shown in the film.