dude! don't mean to sound like an ass but are you really clueless as to what you need to do? geez, borrow a friends car, or rent one! you obviously have access to a set of wheels if you say you don't want to drive around with leaves showing. here's another idea, don't leave your plants in plainview of the car so that the leaves are showing.

here's what I do: transport them in lightproof boxes at night when they're in their dark cycle. this way no light gets to em and nobody will see your plants! when your done, hit this button