I have a van which was originally bought to haul bikes, but I've since have wisened up and purchsed a trailer.
While vans are great for security, mean better economy (as you aren't towing anything) they do have some big compromises.
Getting bikes in and out is a pain in the ass, it is hard to tie bikes down while in a van, and if you van is half decent and you like to carry people around at other times, dirty smelly bikes and gear soon spoil it.
Don't get me wrong, vans are great, you can get changed in them, store heaps of gear and put bikes in them when needed, for regular bike transport I'd recommend a ute or van + trailer combo though.