Is it roomy, will it accommodate the bridal robe ( particularly important if the dress has a chic but fragile train ), is there lots of room to egress gracefully? Wear the same size heels as your marriage shoes and practice getting out and in of the automobile. One for the minister or officiant and a free standing one for you as a couple. Click link to see info on eiffel tower vases for. 3 would really be perfect, those small clip on things. That way even somebody in the back row would not miss a thing.
They would buy gifts or give money, purchase new garments and travel to attend, some long distances that will require planes and hotel stays. Sounds get soaked up and watered down by trees, grass, the great outside. A company or driver that looks after their grounds will also look after their automobile. You do not want to chance a breakdown on the day do you? Ultimately you may wish to decide what style and age of automobile will best compliment your dress and the wedding ceremony itself.