Hi, i hope you guys can advise me on which van would be good to start with. There's myself, husband and 3 kids (and possibly Jess, the dog) to house!! We don't mind getting an awning, so would it be worth getting a 5 berth or stick to a 4 berth? Also, we have a BMW 320d, does anyone tow with one of these and does it cope?! Any advice would be greatly appreciated. Thanks!