If you want to make sure everyone knows it's you when you roll into the parking lot, you could do worse than to convert a Ford Econoline van into a pink Batvan with a turret made of a Volkswagen Beetle. Redditor UltimateArgentinian posted this image, and it appears that this particular vehicle appears nowhere else on the internet.
Why the Beetle on top? The better question is, why not? If you are doing a ridiculous conversion and happen to have a Beetle body laying around, it just adds to the intrigue. It lends visibility to the interior of a panel van, so you can see how close the Joker is in pursuit behind you, and gives you height to see obstacles ahead. Or it may be a way to stand up in your van so you can put your batsuit on without bumping your head. Or it may be a ventilation scheme.
Someone in the comments said they saw this van on the way to auction. We don't know how true that is, but you might want to check online for used vans if you are interested in owning it.