I was thinking of using flying, however I wasn’t sure if you could get acceleration and some other features the vehicle blueprints have access to in a flying template?
When creating the vehicle in a 3d modeling software you can create the wheel bones in the right place, but not skin them to a mesh. Then when you import it into UE4 set it up like you would a normal vehicle, you will also need to set up the tire data, and tire class. To get your car set up it might be easier to skin wheel meshes and then re-import the Skeletal mesh without the the skinned wheels once you have got it all set up. This should work.
You may find it useful to look at the way the Manta was set up in UDK; in reality this was a wheeled vehicle with ultra soft suspension and invisible wheels similar to the above suggestions. I believe similar tricks should work in ue4.